CBSE Class 12 · 2008 · ElectrostaticsVery Short Answer

Draw an equipotential surface for a system consisting of two charges

Q

- Q

separated by a distance

r

in air.

Solution

Around each charge the equipotential surfaces are closed curves (circles in a plane section), crowded near the charges and more widely spaced farther away. The plane perpendicular to the line joining the charges and passing through its mid-point is at zero potential, since the potentials of

+ Q

and

- Q

cancel there.

CBSE Class 12 Board · 2008 · Subjective

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