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NCERT Class XII Chapter
Electrostatic Potential and Capacitance
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Question : 34 of 37
Marks: +1, -0
Describe schematically the equipotential surfaces corresponding to
(a) A constant electric field in the z-direction.
(b) a field that uniformly increases in magnitude but remains in a constant (say, z) direction.
(c) a single positive charge at the origin, and
(d) a uniform grid consisting of long equally spaced parallel charged wires in a plane.
Solution:  
(a) Planes parallel to x-y plane or normal to the electric field in z-direction.
(b) Planes parallel to x-y plane or normal to the electric field in z- direction, but the planes having different fixed potentials will become closer with increase in electric field intensity.
(c) Concentric spherical surfaces with their centres at origin.
(d) A time dependent changing shape nearer to grid, and at far off distances from the grid, it slowly becomes planar and parallel to the grid.
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