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CBSE 12th Physics (Term 1) Paper 2021-22
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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 -

CBSE 12th Physics (Term 1) Paper 2021-22 Physics - Electrostatics Question 8 English
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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