Two conductors are joined by a long copper wire.Thus

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When two conductors are joined by a long copper wire, they become equipotential. This means that the potential difference between them is zero, and so each conductor must be at the same potential. Choice A is not necessarily true since the charge distribution on each conductor could be different. Choice C is not necessarily true as the electric field at the surface of each conductor will depend on the charge density on each conductor. Choice D is not necessarily true as there could be a distribution of free charges on each conductor before they are joined by the wire. Choice E is not necessarily true as the potential on the wire will depend on the charge distribution on each conductor.

Two Conductors Are Joined by a Long Copper Wire