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Question

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


A
An insulator at 0 K is zero
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B
A semiconductor at 0 K is zero
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C
A p-n diode at 300 K is finite, if its is reverse biased
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D
None of these
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Solution

The correct options are
A A semiconductor at $$0$$ K is zero
B A p-n diode at $$300$$ K is finite, if its is reverse biased
D An insulator at $$0$$ K is zero
The resistivity of the insulator is inversely proportional to the temperature
$$\rho \propto \dfrac{1}{T}$$
So, an insulator at 0K is zero
The resistance of semiconductor is directly proportional to the resistivity
$$R\propto \rho$$ 
In reverse bias at $$300K$$ through a P-N junction diode, a small current flows due to minority charge carriers.
The correct option are A, B and C.

Physics

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