NEET Physics Semiconductor Electronics Questions Solved


A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be

(a) A P-type semiconductor                (b) An N-type semiconductor
(c) A PN-junction                               (d) An intrinsic semiconductor

(c) When polarity of the battery is reversed, the P-N junction becomes reverse biased so no current flows.

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