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: Option C
Explanation
F (alpha) (frac{1}{d^2})
F x d2 = constant
F1 x (d1)2 = F2 x (d2)2
d2 = 2d1
F1 x (d1)2 = F2 x (2d1)2
F2 = (frac{1}{4})F1