Question

Two-point charges +8 q and -2 q are located at X= 0 and X= L respectively. The location of the point on the X-axis at which the net electric field due to these point charges is zero is 

(i) 8 L 

ii) 4L 

(iii) 2L 

(iv) L/4

Answer 1

Correct option is : (iii) 2L

At p, k.8q/ (L+x) ² = k.2q/x² 

x = L. 

So distance p from origin = 2L