Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Describe schematically the equipotential surfaces corresponding to:

1. a constant electric field in the z-direction.
2. a field that uniformly increases in magnitude but remains in a constant (say, z) direction.
3. a single positive charge at the origin, and.
4. a uniform grid consisting of long equally spaced parallel charged wires in a plane.