Current Electricity Ques 107
- When a potential difference is applied across, the current passing through
(a) an insulator at $0 $ $K$ is zero
(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
(1999, 3M)
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Answer:
Correct Answer: 107.(a,b,d)
Solution:
Formula:
Electric Current in a Conductor:
- 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.
BETA
