P-N Junction Diode
A semiconductor device X is connected in series with a battery and a resistor. The current of 10 mA is found to pass through the circuit. If the terminals of X are connected in reverse manner, the current drops to almost zero. X may be
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Answer: (b)
- The device conducts in one direction (10 mA) and almost blocks current when reversed: unidirectional conduction.
- Intrinsic or extrinsic semiconductor pieces conduct equally both ways; a Zener under a large enough reverse voltage would conduct strongly.
- So the answer is (b) a p-n junction diode.