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Question

Four electric charges +q,+q,q and q are placed at the corners of a square of side 2L (see figure). The electric potential at point A, midway between the two charges +q and +q, is

201206_bd2a125ab3ad4d1183e6989b745dd94e.png

A

14πϵ02qL(1+5)

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B

14πϵ02qL(1+15)

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C

14πϵ02qL(115)

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D
zero
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Solution

The correct option is C

14πϵ02qL(115)


Here, AB=AE=L and AC=AD=AB2+BC2=L2+(2L)2=5L

Potential at A is VA=14πϵ0[qAB+qAC+qAD+qAE]

or VA=14πϵ0[qL+q5L+q5L+qL]=14πϵ02qL[115]


247961_201206_ans_6174f5dd50e6437785b4c518688aa686.png

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