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Electrostatic Potential and Capacitance

Question

Describe schematically the equipotential surfaces corresponding to a field that uniformly increases in magnitude but remains in a constant (say, z) direction.

Answer

The surfaces where the potential has a constant value are called equipotential surfaces.
The potential in a direction perpendicular to the direction of field remains constant irrespective of the magnitude of the field. Hence, equipotential surface would correspond to planes parallel to x-y plane. The seperation between the planes decrease for same potential difference.