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It two charges of 1 coulomb each are pla...

It two charges of 1 coulomb each are placed 1 km apart,then the force between them will be

A

`9 xx 10^(3) N`

B

` 9 xx 10^(-3) N`

C

` 9 xx 10^(-4) N`

D

`10^(-6)N`

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