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If the charges +Q and -Q are placed at t...

If the charges +Q and -Q are placed at the two vertices of an equilateral triangle of side l, then potential at the third vertex is

A

`1/(4piepsilon_0) (2Q)/l`

B

`1/(4piepsilon_0) Q/l`

C

zero

D

`1/(4piepsilon_0) Q^2/l`

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