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If the distance between two stationary charged particle i...

If the distance between two stationary charged particle is doubled, the magnitude of the electro-static force between them will be

A.

doubled

B.

halved

C.

a quarter of its former value

D.

unchanged

E.

four times the original value

Correct answer is C

F α 1d2

F x d2 = constant

F1 x (d1)2 = F2 x (d2)2

d2 = 2d1

F1 x (d1)2 = F2 x (2d1)2

F2 = 14F1