Two charges 2μC and −2μC 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?
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Solution
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(a) An equipotential surface is the plane on which total potential is zero. It is at the midpoint of the line AB and perpendicular to it.
(b) The direction of the electric field at every point on this surface is normal to the plane in direction of AB.
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