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Two charges 2 μC and −2 μC 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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Given two charges placed at points A and B.

(a) Potential will be zero due to both charges at equipotential surface

i.e., the plane normal to AB and passing through its mid-point has zero potential everywhere. 

(b) The direction of electric field is normal to the plane in the AB direction.

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