An infinite non-conducting sheet has a surface charge density $\sigma = 0.10\, \mu C/m^2$ on one side. How far apart are equipotential surfaces whose potentials differ by $50\, V$
$8.85\, m$
$8.85\, cm$
$8.85\, mm$
$88.5\, mm$
If a unit positive charge is taken from one point to another over an equipotential surface, then
Draw an equipotential surface for an uniform electric field.
Draw an equipotential surface for a point charge.
The diagrams below show regions of equipotentials.A positive charge is moved from $A$ to $B$ in each diagram.
Three equal charges are placed at the corners of an equilateral triangle. Which of the graphs below correctly depicts the equally-spaced equipotential surfaces in the plane of the triangle? (All graphs have the same scale.)