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# Two charges + 2 muC and -2 muC 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 :
(a) the situation is represents in the given figure <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/NCERT_PHY_V01_XII_C02_E01_003_S01.png" width="80%"> <br> An equipotential surface is plane on which total potential is zero everywhere. This plane is normal to line AB. The plane is located at the mid-point of line AB because the magnitude of charges is the same . <br> (b) the direction of the electric field at every point on this surface is normal to the plane in the direction of AB.

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