1
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
Two charges 14 $$\mu$$C and $$-$$4 $$\mu$$C are placed at ($$-$$12 cm, 0, 0) and (12 cm, 0, 0) in an external electric field $$E = \left( {{B \over {{r^2}}}} \right)$$, where B = 1.2 $$\times$$ 106 N/(cm2) and r is in metres. The electrostatic potential energy of the configuration is
A
97.9 J
B
102.1 J
C
2.1 J
D
$$-$$97.9 J
2
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
Assertion (A) : A negative charge in an electric field moves along the direction of the electric field.

Reason (R) : On a negative charge a force acts in the direction of the electric field.
A
Both (A) & (R) are true and (R) is correct explanation of (A).
B
Both (A) & (R) are true and (R) is not correct explanation of (A).
C
(A) is true, but (R) is false.
D
(A) is false and (R) is also false.
3
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
Equipotentials at a large distance from a collection of charges whose total sum is not zero are -
A
spheres
B
planes
C
ellipsoids
D
paraboloids
4
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
Four charges $$-$$q, $$-$$q, +q and +q are placed at the corners of a square of side 2 L is shown in figure. The electric potential at point A midway between the two charges +q and +q is -

A
$${1 \over {4\pi { \in _0}}}{{2q} \over L}\left( {1 - {1 \over {\sqrt 5 }}} \right)$$
B
$${1 \over {4\pi { \in _0}}}{{2q} \over L}\left( {1 + {1 \over {\sqrt 5 }}} \right)$$
C
$${1 \over {4\pi { \in _0}}}{q \over {2L}}\left( {1 - {1 \over {\sqrt 5 }}} \right)$$
D
zero
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