Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
When a potential difference is applied a cross the current passing through: an insulator at 0 K is zero a semiconductor at 0 K is zero a p-n diode at 300 K is finite, if it is reverse biased (4) a metal at 0 K is finiteA) 1 and 2 are correct
B) 2 and 3 are correct
C) 1 and 4 are correct
D) 1, 2 and 3 are correct
Correct Answer: D
Solution :
At OK, a semiconductor becomes a perfect insulator. Therefore, at OK, if same potential difference is applied across an insulator or semiconductor current is zero. But a conductor will become a super conductor at OK. Therefore, current will be finite. In reverse biasing at 300K through a p-n junction diode, a small finite current flows due to minority charge carriers.
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