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In the following configuration of charge...

In the following configuration of charges

Force on charges `q_2` by `q_1` is given by

A

`F_(21) = (1)/(4piin_0) (q_1q_2)/(r^(2)) . hat r _(21)`

B

`F_(21) = (1)/(4piin_0) (q_1q_2)/(r^(2)) . (-hat r _(21))`

C

`F_(21) = (1)/(4piin_0) (q_1q_2)/(r^(3)) . hat r _(21)`

D

`F_(21) = (1)/(4piin_0) (q_1q_2)/(r^(3)) . (-hat r _(21))`

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