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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

Zero

B

`1/(4pi epsilon_0) (2q)/L (1+sqrt5)`

C

`1/(4pi epsilon_0) (2q)/L (1+1/sqrt5)`

D

`1/(4pi epsilon_0) (2q)/L (1-1/sqrt5)`

Text Solution

Verified by Experts

The correct Answer is:
D
`V=(2Kq)/L-(2Kq)/(sqrt5L)`
`=1/(4piepsilon_0).(2q)/L[1-1/sqrt5]`
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