Concepts Of Physics MCQ Edition [Volume 2]PhysicsSemiconductors and Semiconductor Devices

When a wire connects the two ends of a p - n junction,

Options

Aa steady current will exist from the p -side to the n -side
Bno steady current will exist in the circuit
Ca current might or might not exist depending on the resistance of the connecting wire
Da steady current will exist from the n -side to the p -side

Correct answer

B. no steady current will exist in the circuit

Step-by-step solution

When the two ends of a p - n junction are connected by a wire, the circuit is closed but lacks any external source of electromotive force. In thermal equilibrium, the drift current caused by the built-in electric field in the depletion region is exactly balanced by the diffusion current caused by the concentration gradient of charge carriers. The built-in potential barrier cannot drive a steady current through the external wire. If a steady current were to flow, energy would be continuously dissipated as heat in th

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