Equipotential surfaces a) make an angle of 45 degrees with the electric field. b) are parallel to the electric field. c) are perpendicular to the electric field. d) have no relationship to the electric field

Option c) are perpendicular to the electric field

Explanation:

Equipotential surfaces are perpendicular to the electric field. the electric field lines are projected outwards from the equipotential surface, i.e., the lines of the electric field are at 90 to the equipotential surface.

Equipotential surface are those surfaces that have the same potential at any point on the surface. Thus the potential difference at any point on the surface is zero due to same potential.

Any charge particle on this surface will move in a perpendicular direction to the Coulombian force. No work is done by the force on a particle moving on an equipotential surface.

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure

powerful computers now, not then