Which of the following figures shows the correct equipotential surfaces of a system of two positive charges?

$A$ uniform electric field pointing in the positive $x$-direction exists in a region. Let $A$ be the origin,$B$ be the point on the $x$-axis at $x = +1 \, cm$,and $C$ be the point on the $y$-axis at $y = +1 \, cm$. Then the potentials at the points $A$,$B$,and $C$ satisfy

Which of the following statements is not true?

The points having equal potentials are:

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

$A$ charge $Q$ is placed at the centre of a circle of radius $10 \ cm$. Find the work done in moving a charge $q$ between any two points lying on the arc of the circle.