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Identify the type of conductor in which the variation of current with potential difference may depend upon the sign of the potential difference applied.

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in Physics – Class 12 by (135k points)
Identify the type of conductor in which the variation of current with potential difference may depend upon the sign of the potential difference applied.

(a) Metallic conductor

(b) Thyristor

(c) Water voltameter

(d) p-n junction diode

The question was posed to me during an internship interview.

Question is taken from Current Electricity in portion Current Electricity of Physics – Class 12

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The correct option is (d) p-n junction diode

Easiest explanation: p-n junction diode consists of p-type and n-type semiconductors. The V-I relationship is non-linear. When a voltage is applied across junction, very little current flows for the fairly high negative voltage and a current begins to flow for much smaller positive (forward) bias. The magnitude of variation depends upon the sign of potential difference applied across it.

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