Two point charges of `20 mu C` and `80 muC` are 10 cm apart where will the electric field strength be zero on the line joining the charges from `20 mu C` charge

Options

A. 0.1m
B. 0.04m
C. 0.033m
D. 0.33m

Answer

C

Explanation

`E_p=0`
`implies (Kxx20 xx10^(-6))/x^2 = (Kxx80 xx10^(-6))/((10-x)^2) implies (10 -x)/x =2`
`implies 10 - x = 2x implies x = 10//3m`
`implies x =10/3 xx1/100 = 0.033m `