Electrostatistics Test Paper 05 Class 12 Notes | EduRev

Class 12 : Electrostatistics Test Paper 05 Class 12 Notes | EduRev

 Page 1


CBSE TEST PAPER-05 
CLASS - XII PHYSICS (Unit – Electrostatics) 
1. The Plates of a charged capacitor are connected by a voltmeter.  If the plates of
the capacitor are moved further apart. What will be the effect on the reading of
the voltmeter?
[1] 
2. What is the function of dielectric in a capacitor? [1] 
3.
A steam of electrons travelling with speed  
m
s
? at right angles to a uniform
electric field E is deflected in a circular path of radius r.  Prove that 
2
e v
m rE
= ? 
[2] 
4. The distance between the plates of a parallel plate capacitor is d.  A metal plate
of thickness (d/2) is placed between the plates. What will be the effect on the
capacitance?
[2] 
5. Keeping the voltage of the charging source constant.  What would be the percentage
change in the energy stored in a parallel plate capacitor if the separation between its
plates were to be decreased by 10%?
[3] 
6. Two identical plane metallic surfaces A and B
are kept parallel to each other in air
separated by a distance of 1.0 cm as shown in
the figure. Surface A is given a positive
potential of 10V and the outer surface of B is
earthed.
(a) What is the magnitude and direction of
uniform electric field between point Y 
and Z?  What is the work done in moving 
a change of 20 c µ from point X to Y?
(b)  Can we have non-zero electric potential in the space, where electric field 
strength is zero? 
[3] 
A
B
X
Y
Z
Page 2


CBSE TEST PAPER-05 
CLASS - XII PHYSICS (Unit – Electrostatics) 
1. The Plates of a charged capacitor are connected by a voltmeter.  If the plates of
the capacitor are moved further apart. What will be the effect on the reading of
the voltmeter?
[1] 
2. What is the function of dielectric in a capacitor? [1] 
3.
A steam of electrons travelling with speed  
m
s
? at right angles to a uniform
electric field E is deflected in a circular path of radius r.  Prove that 
2
e v
m rE
= ? 
[2] 
4. The distance between the plates of a parallel plate capacitor is d.  A metal plate
of thickness (d/2) is placed between the plates. What will be the effect on the
capacitance?
[2] 
5. Keeping the voltage of the charging source constant.  What would be the percentage
change in the energy stored in a parallel plate capacitor if the separation between its
plates were to be decreased by 10%?
[3] 
6. Two identical plane metallic surfaces A and B
are kept parallel to each other in air
separated by a distance of 1.0 cm as shown in
the figure. Surface A is given a positive
potential of 10V and the outer surface of B is
earthed.
(a) What is the magnitude and direction of
uniform electric field between point Y 
and Z?  What is the work done in moving 
a change of 20 c µ from point X to Y?
(b)  Can we have non-zero electric potential in the space, where electric field 
strength is zero? 
[3] 
A
B
X
Y
Z
7. Figure (a) and (b) shows the field lines of a single positive and negative changes
respectively
(a) Give the signs of the potential difference :  
B A
 and V  -- V Vp Vq - (b) Give the sign of the work done by the field in moving a small positive change 
from Q  to  P. 
(c)  Give the sign of the work done by the field in external agency in moving a 
small negative change from B to A. 
[5] 
8. With the help of a labelled diagram, explain the principle, construction and working
of a vandegraff generator.  Mention its applications?
[5] 
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