are
placed at points A and B, 6 cm apart.
(a)
Identify an equipotential surface of the system.
(b)
What is the direction of the electric field at every point on this surface?
Answer:
(a) The equipotential surface is the plane perpendicular to the line AB joining the two charges and passing through the mid-point. On this plane, potential is zero everywhere.
(b) The direction of electric field is from positive to negative charge i.e. A to B, which is infact perpendicular to the equipotential plane.
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