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Force between two charges q1 and q2 se...

Force between two charges `q_1 and q_2` separated by a distance r is proportional to `q_1q_2//r^(2).` Proportionality constant is

A

` (in_0)/(4pi ) `

B

` 4 pi in_0`

C

` (1)/(4 piin_0)`

D

` 1`

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