Question

Variation of electrostatic potential along the $x$-direction is shown in figure. The correct statement about electric field is

• A. $x$-component at point $B$ is maximum
• B. $x$-component at point $A$ is toward positive $x$-axis
• C. $x$-component at point $C$ is along negative $x$-axis
• D. $x$-component at point $C$ is along positive $x$-axis

Answer 1

Answer: (D)

We know, $E=-\frac{dV}{dx}$.
At $B,dV/dx=0$, hence $E_x=0$.
At $A,dV/dx$ is positive, hence $E_x$ is negative.
At $C,dV/dx$ is negative, hence $E_x$ is positive.