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# Electrostatistics Test Paper 05 Class 12 Notes | EduRev

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

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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?

2. What is the function of dielectric in a capacitor? 
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
= ?

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?

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%?

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?

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?

2. What is the function of dielectric in a capacitor? 
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
= ?

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?

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%?

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?

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.

8. With the help of a labelled diagram, explain the principle, construction and working
of a vandegraff generator.  Mention its applications?

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