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# Physics: Sample Question Paper- 3, Class 12 Notes | EduRev

## NEET : Physics: Sample Question Paper- 3, Class 12 Notes | EduRev

``` Page 1

CBSE XII  |  PHYSICS
Sample Paper – 3

CBSE Board
Class XII Physics
Sample Paper - 3

Time:  Three Hours Maximum Marks: 70

General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
-1
-1
-1
19
8
34
7
23
23
27
C
m s
J s
T ma
J K
/mole
kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
??

1. Is the force acting between two point electric charges q 1 and q 2 kept at some distance
apart in air, attractive or repulsive when (i) q 1q 2 > 0 (ii) q 1q 2 < 0 ?    (1)

2. On a graph show the stopping potential for a given photosensitive surface varying with
the frequencies n 1 and n 2 of incident radiations where n 1 >n 2. Given that intensity is
same for both light radiations.   (1)

3. A message signal of frequency 10 kHz is used to modulate a carrier of frequency 1 MHz.
Find the side bands produced.  (1)

Page 2

CBSE XII  |  PHYSICS
Sample Paper – 3

CBSE Board
Class XII Physics
Sample Paper - 3

Time:  Three Hours Maximum Marks: 70

General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
-1
-1
-1
19
8
34
7
23
23
27
C
m s
J s
T ma
J K
/mole
kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
??

1. Is the force acting between two point electric charges q 1 and q 2 kept at some distance
apart in air, attractive or repulsive when (i) q 1q 2 > 0 (ii) q 1q 2 < 0 ?    (1)

2. On a graph show the stopping potential for a given photosensitive surface varying with
the frequencies n 1 and n 2 of incident radiations where n 1 >n 2. Given that intensity is
same for both light radiations.   (1)

3. A message signal of frequency 10 kHz is used to modulate a carrier of frequency 1 MHz.
Find the side bands produced.  (1)

CBSE XII  |  PHYSICS
Sample Paper – 3

4. Is the diode in the following circuit forward biased or reverse biased? Give reason for
your answer.
(1)

5. What is the frequency range of signals that are transmitted using optical fibres?  (1)

6. A spherical Gaussian surface encloses charges q 1 and q 2 with
66
12
8.85 10 and q = - 8.85 10
??
? ? ? q C C
(i) Calculate the electric flux passing through the surface.
(ii) How would the flux change if the spherical Gaussian surface is replaced with a
cubical Gaussian surface and why?  (1)

7. For a given thermocouple, the emf generated across its ends is given by E = at + bt
2

where t in °C is the temperature of the hot junction, the cold junction being at 0 °C. If a =
10 mV /°C and b = -0.02 mV/°C
2
, calculate the value of inversion temperature in °C.  (1)

8. A 3.0 V battery is connected to an ammeter and a resistor of 3 ohms in series with it.
What is the value of the current if the ammeter used is a galvanometer with a resistance
of 60 ohm?  (1)

9. An electric bulb B and a parallel plate capacitor C are connected in series to the a.c.
mains. The bulb glows with some brightness. How will the glow of the bulb be affected
on introducing a dielectric slab between the plates of the capacitor? Give reasons in
support of your answer.  (2)

10. Discuss the intensity of transmitted light when a Polaroid sheet is rotated between two
crossed Polaroids.  (2)

11. Why is NAND gate called a universal gate. How can it to be used to realize a basic OR
gate?  (2)

12. What is modulation? What are the different types of modulation?  (2)

13. Nuclear density of hydrogen is 2.3x10
17
kg/

m
3
. Given A = 56 for iron, find its nuclear
density.  (2)

14. Distinguish between frequency modulation and amplitude modulation.  (2)

Page 3

CBSE XII  |  PHYSICS
Sample Paper – 3

CBSE Board
Class XII Physics
Sample Paper - 3

Time:  Three Hours Maximum Marks: 70

General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
-1
-1
-1
19
8
34
7
23
23
27
C
m s
J s
T ma
J K
/mole
kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
??

1. Is the force acting between two point electric charges q 1 and q 2 kept at some distance
apart in air, attractive or repulsive when (i) q 1q 2 > 0 (ii) q 1q 2 < 0 ?    (1)

2. On a graph show the stopping potential for a given photosensitive surface varying with
the frequencies n 1 and n 2 of incident radiations where n 1 >n 2. Given that intensity is
same for both light radiations.   (1)

3. A message signal of frequency 10 kHz is used to modulate a carrier of frequency 1 MHz.
Find the side bands produced.  (1)

CBSE XII  |  PHYSICS
Sample Paper – 3

4. Is the diode in the following circuit forward biased or reverse biased? Give reason for
your answer.
(1)

5. What is the frequency range of signals that are transmitted using optical fibres?  (1)

6. A spherical Gaussian surface encloses charges q 1 and q 2 with
66
12
8.85 10 and q = - 8.85 10
??
? ? ? q C C
(i) Calculate the electric flux passing through the surface.
(ii) How would the flux change if the spherical Gaussian surface is replaced with a
cubical Gaussian surface and why?  (1)

7. For a given thermocouple, the emf generated across its ends is given by E = at + bt
2

where t in °C is the temperature of the hot junction, the cold junction being at 0 °C. If a =
10 mV /°C and b = -0.02 mV/°C
2
, calculate the value of inversion temperature in °C.  (1)

8. A 3.0 V battery is connected to an ammeter and a resistor of 3 ohms in series with it.
What is the value of the current if the ammeter used is a galvanometer with a resistance
of 60 ohm?  (1)

9. An electric bulb B and a parallel plate capacitor C are connected in series to the a.c.
mains. The bulb glows with some brightness. How will the glow of the bulb be affected
on introducing a dielectric slab between the plates of the capacitor? Give reasons in
support of your answer.  (2)

10. Discuss the intensity of transmitted light when a Polaroid sheet is rotated between two
crossed Polaroids.  (2)

11. Why is NAND gate called a universal gate. How can it to be used to realize a basic OR
gate?  (2)

12. What is modulation? What are the different types of modulation?  (2)

13. Nuclear density of hydrogen is 2.3x10
17
kg/

m
3
. Given A = 56 for iron, find its nuclear
density.  (2)

14. Distinguish between frequency modulation and amplitude modulation.  (2)

CBSE XII  |  PHYSICS
Sample Paper – 3

15. State Ampere’s circuital law. Write the expression for the magnetic field at the centre of
a circular coil of radius R carrying a current I. Draw the magnetic field lines due to this
coil.
(2)
OR
15.0 ?F capacitor is connected to a 220V, 50Hz source. Find the capacitive reactance
and the rms current in the circuit. If the frequency is doubled, what happens to the
capacitive reactance and the current?  (2)

16. Write the expression for the force acting on a charged particle of charge q moving with
velocity v in the presence of a magnetic field B.
Show that in the presence of this force
(i) the kinetic energy of the particle does not change.
(ii) its instantaneous power is zero.  (2)

17. In Young's double slit experiment using monochromatic light of wavelength ?, the
intensity at a point on the screen where path difference is ?, is K units. What is the
intensity of light at a point where path difference is ?/3?  (3)

18. An electron, ?-particle and a proton have the same de-Broglie wavelength. Which of
these particles has (i) minimum kinetic energy, (ii) maximum kinetic energy, and why?
(3)
19. State the law of radioactive decay. Establish a mathematical relation between half-life
period and disintegration constant of a radioactive nucleus.  (3)

20. In the fusion reaction 1H
2
+ 1H
2
---------> 2He
3
+ 0n
1
, the masses of deuteron, helium and
neutron expressed in amu are 2.015, 3.017 and 1.009 respectively. If 1 kg deuterium
undergoes complete fusion, find the amount of total energy released.  (3)

21. We do not choose to transmit an audio signal by just directly converting it to an e.m.
wave of the same frequency. Give three reasons for the same.  (3)

22. A parallel plate capacitor is charged to potential V by a source of emf E. After removing
the source, the separation between the plates is doubled.
How will the following change:

(i) electric field,
(ii) potential difference, and
(iii) capacitance of the capacitor? Justify your answers.  (3)

Page 4

CBSE XII  |  PHYSICS
Sample Paper – 3

CBSE Board
Class XII Physics
Sample Paper - 3

Time:  Three Hours Maximum Marks: 70

General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
-1
-1
-1
19
8
34
7
23
23
27
C
m s
J s
T ma
J K
/mole
kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
??

1. Is the force acting between two point electric charges q 1 and q 2 kept at some distance
apart in air, attractive or repulsive when (i) q 1q 2 > 0 (ii) q 1q 2 < 0 ?    (1)

2. On a graph show the stopping potential for a given photosensitive surface varying with
the frequencies n 1 and n 2 of incident radiations where n 1 >n 2. Given that intensity is
same for both light radiations.   (1)

3. A message signal of frequency 10 kHz is used to modulate a carrier of frequency 1 MHz.
Find the side bands produced.  (1)

CBSE XII  |  PHYSICS
Sample Paper – 3

4. Is the diode in the following circuit forward biased or reverse biased? Give reason for
your answer.
(1)

5. What is the frequency range of signals that are transmitted using optical fibres?  (1)

6. A spherical Gaussian surface encloses charges q 1 and q 2 with
66
12
8.85 10 and q = - 8.85 10
??
? ? ? q C C
(i) Calculate the electric flux passing through the surface.
(ii) How would the flux change if the spherical Gaussian surface is replaced with a
cubical Gaussian surface and why?  (1)

7. For a given thermocouple, the emf generated across its ends is given by E = at + bt
2

where t in °C is the temperature of the hot junction, the cold junction being at 0 °C. If a =
10 mV /°C and b = -0.02 mV/°C
2
, calculate the value of inversion temperature in °C.  (1)

8. A 3.0 V battery is connected to an ammeter and a resistor of 3 ohms in series with it.
What is the value of the current if the ammeter used is a galvanometer with a resistance
of 60 ohm?  (1)

9. An electric bulb B and a parallel plate capacitor C are connected in series to the a.c.
mains. The bulb glows with some brightness. How will the glow of the bulb be affected
on introducing a dielectric slab between the plates of the capacitor? Give reasons in
support of your answer.  (2)

10. Discuss the intensity of transmitted light when a Polaroid sheet is rotated between two
crossed Polaroids.  (2)

11. Why is NAND gate called a universal gate. How can it to be used to realize a basic OR
gate?  (2)

12. What is modulation? What are the different types of modulation?  (2)

13. Nuclear density of hydrogen is 2.3x10
17
kg/

m
3
. Given A = 56 for iron, find its nuclear
density.  (2)

14. Distinguish between frequency modulation and amplitude modulation.  (2)

CBSE XII  |  PHYSICS
Sample Paper – 3

15. State Ampere’s circuital law. Write the expression for the magnetic field at the centre of
a circular coil of radius R carrying a current I. Draw the magnetic field lines due to this
coil.
(2)
OR
15.0 ?F capacitor is connected to a 220V, 50Hz source. Find the capacitive reactance
and the rms current in the circuit. If the frequency is doubled, what happens to the
capacitive reactance and the current?  (2)

16. Write the expression for the force acting on a charged particle of charge q moving with
velocity v in the presence of a magnetic field B.
Show that in the presence of this force
(i) the kinetic energy of the particle does not change.
(ii) its instantaneous power is zero.  (2)

17. In Young's double slit experiment using monochromatic light of wavelength ?, the
intensity at a point on the screen where path difference is ?, is K units. What is the
intensity of light at a point where path difference is ?/3?  (3)

18. An electron, ?-particle and a proton have the same de-Broglie wavelength. Which of
these particles has (i) minimum kinetic energy, (ii) maximum kinetic energy, and why?
(3)
19. State the law of radioactive decay. Establish a mathematical relation between half-life
period and disintegration constant of a radioactive nucleus.  (3)

20. In the fusion reaction 1H
2
+ 1H
2
---------> 2He
3
+ 0n
1
, the masses of deuteron, helium and
neutron expressed in amu are 2.015, 3.017 and 1.009 respectively. If 1 kg deuterium
undergoes complete fusion, find the amount of total energy released.  (3)

21. We do not choose to transmit an audio signal by just directly converting it to an e.m.
wave of the same frequency. Give three reasons for the same.  (3)

22. A parallel plate capacitor is charged to potential V by a source of emf E. After removing
the source, the separation between the plates is doubled.
How will the following change:

(i) electric field,
(ii) potential difference, and
(iii) capacitance of the capacitor? Justify your answers.  (3)

CBSE XII  |  PHYSICS
Sample Paper – 3

23. For a transistor, the current amplification factor is 0.8 when the transistor is connected
in common emitter configuration. Calculate the change in the collector current when
the base current changes by 6 mA.  (3)
OR
How many electrons should be removed from a coin of mass 3.2 g, so that it just float in an
electric field of intensity 10
10
NC
-1
, directed upward.  (3)

24. When a transistor amplifier of current gain of 75 is given an input signal, V i= 2 sin (157t
+ ? /2), the output signal is found to be V O= 200 sin (157t +3 ? /2).
In which mode is the transistor being used? Justify your result with proper explanation.   (3)

25. The energy levels of an atom of element are shown in the following diagram. Which one
of the level transitions will result in the emission of photons of wavelength 620 nm?
Support your answer with mathematical calculations.  (3)

26. One day Sita was coming back to home from school by her school bus. She saw a man
was lying down at the road side and no one was there to help him. She thought it as the
case of a major accident. She asked the driver to stop the bus and came out of the bus.
She took the injured person to the nearest hospital taking help of a taxi.  She sent the
patient under treatment and for the condition analysis through X-ray etc. After his first
aid, she called her parents and explained the entire situation. Her parents felt proud of
Sita and her bravery. When the patient became conscious she took his parents contact
number and called them to take care of the patient. The patient's parents thanked her
and obliged her for the help.

(a) What are the values that are associated with Sita?
(b) What is an X-ray? How it is used in the medical field?  (4)

Page 5

CBSE XII  |  PHYSICS
Sample Paper – 3

CBSE Board
Class XII Physics
Sample Paper - 3

Time:  Three Hours Maximum Marks: 70

General Instructions
(a) All questions are compulsory.
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to
16 carry two marks each, questions 17 to 25 carry three marks each and questions
27 to 29 carry five marks each.
(c) Question 26 is a value based question carrying four marks.
(d) There is no overall choice. However, an internal choice has been provided in one
question of two marks, one question of three marks and all three questions of five
marks each. You have to attempt only one of the given choices in such questions.
(e) Use of calculator is not permitted.
(f) You may use the following physical constants wherever necessary.
-1
-1
-1
19
8
34
7
23
23
27
C
m s
J s
T ma
J K
/mole
kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
??

1. Is the force acting between two point electric charges q 1 and q 2 kept at some distance
apart in air, attractive or repulsive when (i) q 1q 2 > 0 (ii) q 1q 2 < 0 ?    (1)

2. On a graph show the stopping potential for a given photosensitive surface varying with
the frequencies n 1 and n 2 of incident radiations where n 1 >n 2. Given that intensity is
same for both light radiations.   (1)

3. A message signal of frequency 10 kHz is used to modulate a carrier of frequency 1 MHz.
Find the side bands produced.  (1)

CBSE XII  |  PHYSICS
Sample Paper – 3

4. Is the diode in the following circuit forward biased or reverse biased? Give reason for
your answer.
(1)

5. What is the frequency range of signals that are transmitted using optical fibres?  (1)

6. A spherical Gaussian surface encloses charges q 1 and q 2 with
66
12
8.85 10 and q = - 8.85 10
??
? ? ? q C C
(i) Calculate the electric flux passing through the surface.
(ii) How would the flux change if the spherical Gaussian surface is replaced with a
cubical Gaussian surface and why?  (1)

7. For a given thermocouple, the emf generated across its ends is given by E = at + bt
2

where t in °C is the temperature of the hot junction, the cold junction being at 0 °C. If a =
10 mV /°C and b = -0.02 mV/°C
2
, calculate the value of inversion temperature in °C.  (1)

8. A 3.0 V battery is connected to an ammeter and a resistor of 3 ohms in series with it.
What is the value of the current if the ammeter used is a galvanometer with a resistance
of 60 ohm?  (1)

9. An electric bulb B and a parallel plate capacitor C are connected in series to the a.c.
mains. The bulb glows with some brightness. How will the glow of the bulb be affected
on introducing a dielectric slab between the plates of the capacitor? Give reasons in
support of your answer.  (2)

10. Discuss the intensity of transmitted light when a Polaroid sheet is rotated between two
crossed Polaroids.  (2)

11. Why is NAND gate called a universal gate. How can it to be used to realize a basic OR
gate?  (2)

12. What is modulation? What are the different types of modulation?  (2)

13. Nuclear density of hydrogen is 2.3x10
17
kg/

m
3
. Given A = 56 for iron, find its nuclear
density.  (2)

14. Distinguish between frequency modulation and amplitude modulation.  (2)

CBSE XII  |  PHYSICS
Sample Paper – 3

15. State Ampere’s circuital law. Write the expression for the magnetic field at the centre of
a circular coil of radius R carrying a current I. Draw the magnetic field lines due to this
coil.
(2)
OR
15.0 ?F capacitor is connected to a 220V, 50Hz source. Find the capacitive reactance
and the rms current in the circuit. If the frequency is doubled, what happens to the
capacitive reactance and the current?  (2)

16. Write the expression for the force acting on a charged particle of charge q moving with
velocity v in the presence of a magnetic field B.
Show that in the presence of this force
(i) the kinetic energy of the particle does not change.
(ii) its instantaneous power is zero.  (2)

17. In Young's double slit experiment using monochromatic light of wavelength ?, the
intensity at a point on the screen where path difference is ?, is K units. What is the
intensity of light at a point where path difference is ?/3?  (3)

18. An electron, ?-particle and a proton have the same de-Broglie wavelength. Which of
these particles has (i) minimum kinetic energy, (ii) maximum kinetic energy, and why?
(3)
19. State the law of radioactive decay. Establish a mathematical relation between half-life
period and disintegration constant of a radioactive nucleus.  (3)

20. In the fusion reaction 1H
2
+ 1H
2
---------> 2He
3
+ 0n
1
, the masses of deuteron, helium and
neutron expressed in amu are 2.015, 3.017 and 1.009 respectively. If 1 kg deuterium
undergoes complete fusion, find the amount of total energy released.  (3)

21. We do not choose to transmit an audio signal by just directly converting it to an e.m.
wave of the same frequency. Give three reasons for the same.  (3)

22. A parallel plate capacitor is charged to potential V by a source of emf E. After removing
the source, the separation between the plates is doubled.
How will the following change:

(i) electric field,
(ii) potential difference, and
(iii) capacitance of the capacitor? Justify your answers.  (3)

CBSE XII  |  PHYSICS
Sample Paper – 3

23. For a transistor, the current amplification factor is 0.8 when the transistor is connected
in common emitter configuration. Calculate the change in the collector current when
the base current changes by 6 mA.  (3)
OR
How many electrons should be removed from a coin of mass 3.2 g, so that it just float in an
electric field of intensity 10
10
NC
-1
, directed upward.  (3)

24. When a transistor amplifier of current gain of 75 is given an input signal, V i= 2 sin (157t
+ ? /2), the output signal is found to be V O= 200 sin (157t +3 ? /2).
In which mode is the transistor being used? Justify your result with proper explanation.   (3)

25. The energy levels of an atom of element are shown in the following diagram. Which one
of the level transitions will result in the emission of photons of wavelength 620 nm?
Support your answer with mathematical calculations.  (3)

26. One day Sita was coming back to home from school by her school bus. She saw a man
was lying down at the road side and no one was there to help him. She thought it as the
case of a major accident. She asked the driver to stop the bus and came out of the bus.
She took the injured person to the nearest hospital taking help of a taxi.  She sent the
patient under treatment and for the condition analysis through X-ray etc. After his first
aid, she called her parents and explained the entire situation. Her parents felt proud of
Sita and her bravery. When the patient became conscious she took his parents contact
number and called them to take care of the patient. The patient's parents thanked her
and obliged her for the help.

(a) What are the values that are associated with Sita?
(b) What is an X-ray? How it is used in the medical field?  (4)

CBSE XII  |  PHYSICS
Sample Paper – 3

27.
(a) Define the term dipole moment and its direction. State its SI unit. Deduce the
expression for the torque acting on it.
(b) In a particular situation, it has its dipole moment aligned with the electric field. Is
the equilibrium stable or unstable?  (5 marks)
OR
A transistor is used in common emitter mode in an amplifier circuit. When a signal of
20 mV is added to the base-emitter voltage, the base current changes by 20 A ? and
the collector current changes by 2 mA. The load resistance is 5k ? . Calculate (a) the
factor ? , (b) the input resistance R BE, (c) the transconductance and (d) the voltage
gain.  (5)

28.
(a) State Lenz’s law. Which conservation law can be used to explain this law?
(b) A wheel with 10 metallic spokes each 0.5m long is rotated with a speed of
120rev/min in a plane normal to the horizontal component of earth’s magnetic field
at a place where the earth’s field is 0.4x10
-4
G. What is the induced emf between the
axle and the rim of the wheel?
(c) Two moving coil meters, M 1 and M 2 have the following particulars:
R 1 = 10  , N 1 = 30,
A 1 = 3.6 x 10
-3
m
2
, B 1 = 0.25 T
R 2 = 14  , N 2 = 42
A 2 = 1.8 x 10
-3
m
2
, B 2 = 0.50 T
(The spring constants are identical for the two meters). Determine the ratio of (a)
current sensitivity and (b) voltage sensitivity of M 2 and M 1.    (5)
OR
(a) An electron & a proton moving with the same speed enter a uniform magnetic field
B perpendicularly. Which particle will have larger radius of its circular path? Find
the ratio of their radii. The masses of electron & proton are 9.1 x 10
-31
kg & 1.67 x
10
-27
kg.
(b) Show that for a moving charged particle in a uniform magnetic field, the kinetic
energy of the particle remains constant.
(c) A coil placed in the plane of the page has a current in the clockwise direction when
looking from above. What will be the change in the magnetic field at the center of
the coil if
(i) the current through the coil is reduced to half?
(ii) radius of the coil is doubled ?
(iii) what will be the direction of the magnetic field?   (5 marks)

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