Fig. shows the electric field lines around three points charges A,B,C.
(a) Which charges are positive ?
(b) Which charge has the largest magnitude ? Why ?
(c) In which regions of the picture could be the electric field be zero? Justify your answer.
(i) near A, (ii) near B, (iii) near C, (iv) nowhere.

Explanation

(i). Here, in the figure, the electric lines offorce emanate from A and C. Therefore, charges A and C must be positive.
(ii) The number of electric lines of forces enamating is maximum for charge C here, so C must have the largest magnitude.
(iii). Point between two like charges where electrostatic force is zero is called netural point. So, the neutral point lies between A and C only.
Now the position of neutral point depends on the strength of the forces of cahrges. here, more, more number of electric lines of forces shows higher strength of charge C than A. So, neutral point lies near A.