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Four equal charges +q placed at four cor...

Four equal charges `+q` placed at four corners of a square with its centre at orign and lying in ` yz` plane. The electrostatic potential energy of varies on x-axis as-

A

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B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
Distance of charge on `x` from any vertex of square is `sqrt (x^2 + L^2/2)`
`V_q = (4 Kq)/(sqrt (x^2 + L^2 /2)), U_q = (4 Kq^2)/(sqrt (x^2 + L/2))`
which is max at ` x = 0`, at center of square.
` (##NG_PHY_C01_E01_019_S01.png" width="80%"> .
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