Figure shows a set of equipotential surfaces. The magnitude and direction of electric field that exists in the region is .........
$10 \sqrt{2} \,V / m$ at $45^{\circ}$ with $x$-axis
$10 \sqrt{2} \,V / m$ at $-45^{\circ}$ with $x$-axis
$5 \sqrt{2} \,V / m$ at $45^{\circ}$ with $x$-axis
$5 \sqrt{2} \,V / m$ at $-45^{\circ}$ with $x$-axis
The diagrams below show regions of equipotentials.A positive charge is moved from $A$ to $B$ in each diagram.
Draw an equipotential surface of two identical positive charges for small distance.
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.
Define an equipotential surface.
Show that the direction of electric field at a given is normal to the equipotential surface passing through that point.