Current Electricity Ques 107 — JEE PYQ Chapterwise

  1. 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)

Show Answer

Answer:

Correct Answer: 107.(a,b,d)

Solution:

Formula:

Electric Current in a Conductor:

  1. 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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