Question

A few electric field lines for a system of two charges `Q_(1) and Q_(2)` fixed at two different points on the X-axis are shown in Fig.

(i) what is the nature of charges ?
(ii) which one of the two is bigger ?
(iii) What is the ratio of magnitude of two charges ?
(iv) Where can the electric field due to two charges be zero ?

Answer 1

(i) As electric lines of force start from `Q_(1)` and end at `Q_(2)`, therefore `Q_(1)` is possitive and `Q_(2)` is negative.
(ii) Strength of charge is determined by the number fo electric lines of force. Therefore, `Q_(1) gt Q_(2)`.
(iii) `(Q_(1))/(Q_(2)) = (14)/(9)`
(iv) The electric field due to the sytem fo two charges will be zero at a point to the right of charge `Q_(2)`.