Q 1511745629.     Two point charges `-q` and `+ q` are located at point's `(0, 0, - a)` and, `(0, 0, a)`
respectively. The electric potential at a point `(0, 0, z)`, where `z > a` is

BITSAT 2009
A

` (qa)/ (4piepsilon_(0)z^(2)`

B

` (q)/ (4piepsilon_(0)a`

C

` (2qa)/ (4piepsilon_(0)(z^(2)-a^(2))`

D

` (2qa)/ (4piepsilon_(0)(z^(2)+a^(2))`

HINT

`V = 1/ (4piepsilon_(0))xx q/ r`
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