The points having equal potentials are:

If a unit charge is taken from one point to another point over an equipotential surface,then

Electric field is always ...... to the equipotential surface at every point. (Fill in the gap)

Which of the following statements is not true?

The angle between an equipotential surface and the electric lines of force is .......$^o$.

$A$ uniform electric field of magnitude $E = 100 \ V/m$ is directed along the line $y = x + 3$. Find the potential difference $V_A - V_B$ between points $A(3, 1)$ and $B(1, 3)$.