Two ideantical point charges are placed at a separation of `d`. `P` is a point on the line joining the charges, at a distance `x` from any one charge. The field at `P` is `E, E` is plotted against `x` for value of `x` from close to zero to slightly less then `d`. Which of the following represents the resulting curve

Options

A.
B.
C.
D.

Answer

d

Explanation

At mid point, `E=0`
Before mid point, `E` is positive. This is maximum near the charge and decreases towards mid point.
After mid point, `E` is negative, The curve crosses `x`-axes at `x`-axis at `x= d//2`. From centre to end, `E` decreases.
The Varitation is shown by curved.