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


 
 
 
Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in 
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
 
 
 
Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in 
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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