Question

Two charges each of charge + 10uc are kept
on Y-axis at y = -a and y = +a respectively,
Another point charge -20uc is placed at the
origin and given a small displacement x(x<<a)
along X-axis. The force acting on the point
charge is
1) 3.6x/a2
2)2.4x2/2
3)3.6x/a3
4) 4.8x/a2
answer is opt (3) plzz explain how is it
​

Answer 1

Answer:

Two charges each of charge + 10uc are kept

on Y-axis at y = -a and y = +a respectively,

Another point charge -20uc is placed at the

origin and given a small displacement x(x<<a)

along X-axis. The force acting on the point

charge is

1) 3.6x/a2

2)2.4x2/2

3)3.6x/a3

4) 4.8x/a