Define an equipotential surface.
Draw an equipotential surface for a point charge.
Two point charges of magnitude $+q$ and $-q$ are placed at $\left( { - \frac{d}{2},0,0} \right)$ and $\left( {\frac{d}{2},0,0} \right)$, respectively. Find the equation of the equipotential surface where the potential is zero.
Equipotential surfaces associated with an electric field which is increasing in magnitude along the $x$-direction are
Assertion : Two equipotential surfaces cannot cut each other.
Reason : Two equipotential surfaces are parallel to each other.
Electric field is always ...... to the equipotential surface at every point. (Fill in the gap)