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Four electric charges +q, +q, -q and -q ...

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`, mid-way between the two charges `+q` and `+q`, is

A

`(1)/(4pi epsilon_(0))(2q)/(L)(1+(1)/(sqrt(5)))`

B

`(1)/(4pi epsilon_(0))(2q)/(L)(1-(1)/(sqrt(5)))`

C

zero

D

`(1)/(4pi epsilon_(0))(2q)/(L)(1+sqrt(5))`

Text Solution

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The correct Answer is:
B
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