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Three charges q, -q and q0, are placed a...

Three charges q, -q and `q_0`, are placed as shown in figure. The magnitude of the net force on the charge `q_0` at point O is `[k = 1/((4 pi epsi_0))]`

A

0

B

`(2kq q_0)/(a^z)`

C

`(sqrt2 k q q_0)/(a^2)`

D

`1/(sqrt2) (kq q_0)/(a^2)`

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