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

Figure shows a set of equipotential surfaces. The magnitude and direction of electric field that exists in the region is .........

This question has Statement $-1$ and Statement $-2$ Of the four choices given after the Statements, choose the one that best describes the two Statements

Statement $1$ : No work is required to be done to move a test charge between any two points on an equipotential surface

Statement $2$ : Electric lines of force at the equipotential surfaces are mutually perpendicular to each other

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

Three infinitely long linear charges of charge density $\lambda $ , $\lambda $ and $-2\lambda $ are placed in space. A point in space is specified by its perpendicular distance $r_1 , r_2 $ and $ r_3$ respectively from the linear charges. For the points which are equipotential

Write the characteristics of equipotential surface.