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All questions of Magnetic Flux for EmSAT Achieve Exam
Whenever the magnetic flux (
) linked with a coil changes the emf is induced in the circuit, This emf lasts- a)as long as the change in flux continues.
- b)for a long time
- c)for a short time
- d)forever
Correct answer is option 'A'. Can you explain this answer?
Whenever the magnetic flux () linked with a coil changes the emf is induced in the circuit, This emf lasts
) linked with a coil changes the emf is induced in the circuit, This emf lastsa)
as long as the change in flux continues.
b)
for a long time
c)
for a short time
d)
forever
|
Idamangala Merlin answered |
Answer a it is faraday 1st law
A magnet is moved towards the coil (a) quickly and (b) slowly, and then the work done is- a)does not depend on the motion of the magnet.
- b)smaller in case (a)
- c)equal in both cases
- d)larger in case (a)
Correct answer is option 'D'. Can you explain this answer?
A magnet is moved towards the coil (a) quickly and (b) slowly, and then the work done is
a)
does not depend on the motion of the magnet.
b)
smaller in case (a)
c)
equal in both cases
d)
larger in case (a)
|
Jayant Mishra answered |
A magnet is moved towards the coil (a) quickly and (b) slowly, and then the work done is This is because when the magnet is moved quickly, opposing emf induced in the coil will be more.
A coil of area 10 cm² of 20 turns is placed in uniform magnetic field of 104 gauss. The normal to the plane of the coil makes an angle of 60° with the magnetic field. The flux in maxwell through the coil is
- a)105
- b)106
- c)103
- d)104
Correct answer is option 'B'. Can you explain this answer?
A coil of area 10 cm² of 20 turns is placed in uniform magnetic field of 104 gauss. The normal to the plane of the coil makes an angle of 60° with the magnetic field. The flux in maxwell through the coil is
a)
105
b)
106
c)
103
d)
104
|
Hansa Sharma answered |
In the given circuit the maximum deflection in the galvanometer occurs when
- a)magnet is rotated inside the coil
- b)magnet is stationary at the center of the coil.
- c)numbers of turns in the coil is reduced.
- d)magnet is pushed into the coil.
Correct answer is option 'D'. Can you explain this answer?
In the given circuit the maximum deflection in the galvanometer occurs when
a)
magnet is rotated inside the coil
b)
magnet is stationary at the center of the coil.
c)
numbers of turns in the coil is reduced.
d)
magnet is pushed into the coil.
|
sankalp raj answered |
This question based on lenz law. as the bar magnet is moving , there is a change in magnetic flux.This will give polarity in the coil. Hence the current developed in the coil. so the option d is right.
A constant current I is maintained in a solenoid. Which of the following quantities will not increase if an iron rod is inserted in the solenoid along its axis?- a)Magnetic field at the centre.
- b)Self-inductance of the solenoid.
- c)Magnetic flux linked with the solenoid.
- d)Rate of joule heating.
Correct answer is option 'D'. Can you explain this answer?
A constant current I is maintained in a solenoid. Which of the following quantities will not increase if an iron rod is inserted in the solenoid along its axis?
a)
Magnetic field at the centre.
b)
Self-inductance of the solenoid.
c)
Magnetic flux linked with the solenoid.
d)
Rate of joule heating.
|
Vijay Bansal answered |
Rate of joule heating will not increase since the current is constant in the solenoid.
The total number of magnetic lines of force crossing a surface normally is termed as- a)Magnetic field.
- b)Magnetic permeability.
- c)Magnetic flux.
- d)Magnetic susceptibility.
Correct answer is option 'C'. Can you explain this answer?
The total number of magnetic lines of force crossing a surface normally is termed as
a)
Magnetic field.
b)
Magnetic permeability.
c)
Magnetic flux.
d)
Magnetic susceptibility.
|
Nabanita Pillai answered |
The measurement of the total magnetic field that passes through a given area is known as magnetic flux. It is helpful in describing the effects of the magnetic force on something occupying a given area.
If we consider a simple flat area A as our example and angle θ as the angle between the normal to the surface and a magnetic field vector, then the magnetic flux is given by the equation:
ϕ=BAcosΘ
If we consider a simple flat area A as our example and angle θ as the angle between the normal to the surface and a magnetic field vector, then the magnetic flux is given by the equation:
ϕ=BAcosΘ
A cylindrical bar magnet is held along the axis of a circular conducting loop. Which one of the following movements of the bar magnet will not induce a current in the loop?- a)The magnet is rotated about its own axis.
- b)The magnet is moved along its length.
- c)The magnet is rotated about an axis passing through its mid point and perpendicular to its length.
- d)The magnet is rotated about an axis through one end and perpendicular to its length.
Correct answer is option 'A'. Can you explain this answer?
A cylindrical bar magnet is held along the axis of a circular conducting loop. Which one of the following movements of the bar magnet will not induce a current in the loop?
a)
The magnet is rotated about its own axis.
b)
The magnet is moved along its length.
c)
The magnet is rotated about an axis passing through its mid point and perpendicular to its length.
d)
The magnet is rotated about an axis through one end and perpendicular to its length.
|
Anshika Menon answered |
A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then there is no change in magnetic flux, there is no emf induced in the coil, no current will be induced in the coil.
) linked with a coil is related to the number (N) of turns of the coil as
Find the flux contained by the material when the flux density is 11.7 Tesla and the area is 2 units.- a)23.4
- b)12.3
- c)32.4
- d)21.3
Correct answer is option 'A'. Can you explain this answer?
Find the flux contained by the material when the flux density is 11.7 Tesla and the area is 2 units.
a)
23.4
b)
12.3
c)
32.4
d)
21.3
|
Snehal Shah answered |
The total flux is given by φ = ∫ B.ds, where ∫ds is the area. Thus φ = BA. We get φ = 11.7 x 2 = 23.4 units.
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