Two point charges `q_1` and `q_2` are fixed at a separation of 20 cm. Locate the point(s) on the line joining the charges where the net electric field intensity is zero.
(i)`q_1=+2muC` and `q_2=-4 muC`
(ii)`q_1=+2muC` and `q_2=-2muC`
(iii)`q_1=+2muC` and `q_2=+4muC`

Explanation

(i) `(1+sqrt2)/5` m to the left of `q_1` , (ii) no such point exist , (iii) `(sqrt2-1)/5` m to the right of `q_1`