Q. Two identical 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 values of $x$ from close to zero to slightly less than $d.$ Which of the following represents the resulting curve
A)
B)
C)
D)
Explanation
(d) 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 $x$-axis at $x$-axis at $x = d/2.$ From centre to end, $E$ decreases
The variation is shown by curve $d$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.