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# CBSE Test Paper (Electrostatics) (Class - XII Physics) Class 12 Notes | EduRev

## Class 12 : CBSE Test Paper (Electrostatics) (Class - XII Physics) Class 12 Notes | EduRev

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CBSE TEST PAPER-01
CLASS - XII PHYSICS (Unit – Electrostatics)
1. Show does the force between two point charges change if the dielectric constant
of the medium in which they are kept increase?

2. A charged rod P attracts rod R where as P repels another charged rod Q. What
type of force is developed between Q and R?

3. A free proton and a free electron are placed in a uniform field. Which of the two
experience greater force and greater acceleration?

4. No two electric lines of force can intersect each other?  Why? 
5. A particle of mass m and charge q is released form rest in  a uniform electric
field of intensity E. calculate the kinetic energy it attains after moving a distance
s  between the plates?

6. Two point charges +q and +9q are separated by a distance of 10 a. Find the point
on the line joining the two changes where electric field is zero?

7.
Define the term dipole moment P
 
of an electric dipole indicating its direction.
Write its S.I unit. An electric dipole is placed in a uniform electric field E

. Deduce
the expression for the Torque acting on it.

8.
(1) The electric field E

due to a point change at any point near to it is defined
as:
q c
F
E Lim
q
?
=


where q is the test charge and F

is the force acting on it.
What is the significance of
lim
q o ?
in this expression?
(2) Two charges each 2 x 10
-7
C but opposite in sign forms a system. These
charges are located at points A (0,0, -10) cm and B(0,0, +10) cm
respectively. What is the total charge and electric dipole moment of the
system?

9. (a) Sketch electric lines of force due to (i) isolated positive change (ie q>0) and
(ii) isolated negative change ( ie q<0)
(b) Two point changes q and –q are placed at a distance 2a apart. Calculate the
electric field at a point P situated at a distance r along the perpendicular
bisector of the line joining the charges. What is the field when r >> a?

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