SATHEE: Current Electricity 5 Question 13

Current Electricity 5 Question 13

13. When a potential difference is applied across, the current passing through

(a) an insulator at $0 K$ is zero

(1999, 3M)

(b) a semiconductor at $0 K$ is zero

(c) a metal at $0 K$ is finite

(d) a $p$ - $n$ diode at $300 K$ is finite, if it is reverse biased

Value Based Type Question

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Solution:

At $0 K$ , a semiconductor becomes a perfect insulator. Therefore, at $0 K$ , if some potential difference is applied across an insulator or semiconductor, current is zero. But a conductor will become a super conductors at $0 K$ . Therefore, current will be infinite. In reverse biasing at $300 K$ through a $p$ -n junction diode, a small finite current flows due to minority charge carriers.

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Current Electricity 5 Question 13

13. When a potential difference is applied across, the current passing through

Value Based Type Question

Solution:

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