A charged particle of mass `3 xx 10^(-6)` kg is held stationary in spacing in an electric field of strength `10^(6)` `NC^(-1)` directed vertically downwards. The charge on the particle is (`g = 10 ms^(-2))

Options

A. `-20 xx 10^(-3) mu`C
B. `-3 xx 10^(-5) mu`C
C. `5 xx 10^(-5) mu`C
D. `20 xx 10^(-5) mu`C

Answer

(b)

Explanation

Electric Force = weight of the particle
qE = -mg
`rArr q = -mg/E = -3 xx 10^(-6) xx10/10^(6) = - 3 xx 10^(-5) muC`