Question

Equipotential surface associated with an electric field which is increasing in magnitude along the $x-$ direction are

• A. Planes parallel to $YZ-$ plane
• B. Planes parallel to $XY-$ plane
• C. Planes parallel to $XZ-$ plane
• D. Coaxial cylinders of increasing radii around $x-$ axis.

Answer 1

The correct option is A Planes parallel to $YZ-$ plane

Equipotential surface are always perpendicular to the direction of electric field.


Since $\overrightarrow{E}$ is along $+vex-$ direction.
Thus equipotential surface will be planes perpendicular to direction of $\overrightarrow{E}$ , i.e. planes parallel to $YZ-$ plane as shown in figure.

$\begin{array}{c}\text{Why this question}?\\ \text{Tip: Electric field lines flow from region}\\ \text{of high potential to low potential. The potential}\downarrow \\ \text{along the direction of}\overrightarrow{E}\end{array}$