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# CBSE Test Paper -05 CLASS - XII PHYSICS (Unit – Electrostatics), CBSE Class 12 Notes | EduRev

## Class 12 : CBSE Test Paper -05 CLASS - XII PHYSICS (Unit – Electrostatics), CBSE 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?
[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

Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks
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

Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks
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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