A semi-conducting device is connected in a series in circuit with a battery and a resistance. A current is allowed to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be :
( a) a p-n junction
Text Solution
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When the connection of battery is reversed, then a semi conduction device is reverse biased. We know that in forward biasing of p-n junction the current is of the order of milliampere while in reverse biasing the current is of the order of microampere (negligible). Thus, device is a p -n junction.
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