When a point charge of `(1)/(3)mu C` is placed on the axis of a thin disc of total charge `(2)/(3)mu C` (uniform distribution) aned radius `3.95 cm` such that distance. Between point charge and centre of disc is 1 m, then force experienced by disc is approximately :

Options

A. `4mN`
B. `6mN`
C. `3mN`
D. `2mN`

Answer

D

Explanation

Behaviour of disc is like a point charge because distance between the disc and the point charge is very large in comparison to radius of disc.
`F = (9 xx 10^(9)xx (2)/(3)mu C xx (1)/(3) muC)/(1^(2))=2mN`