and are the electrical conductivities of Ge and Na respec…

Physics Current Electricity Electric Conduction, Ohm's Law, Electric Current, Potential Deffrence MCQ (Single Correct)

and are the electrical conductivities of Ge and Na respectively. If these substances are heated, then

Both

and

increase

increases and

decreases

decreases and

increases

Both

and

decrease

Text Solution

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The correct answer is:

Ge is semiconductor and Na is a metal. The conductivity of semiconductor increases and that of the metals decreases with the rise in temperature.

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