Equipotential surfaces associated with an electric field which is increasing in magnitude along the x-direction are:
A
Planes parallel to yz-plane
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B
Planes parallel to xy-plane
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C
Planes parallel to xz-plane
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D
Coaxial cylinders of increasing radii around the x-axis
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Solution
The correct option is A Planes parallel to yz-plane We know that →E=−→∇ϕ
Thus the equipotential surface is always perpendicular to the direction of electric field. As the field is along x-direction, equipotential surface must be parallel to yz-plane.