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Resistance and Resistivity

As the temper...

Question

As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity
(a) increases
(b) decreases
(c) remains constant
(d) may increase or decrease

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Solution

(d) may increase or decrease

The product of resistivity and conductivity is independent of temperature. As the temperature of a metallic resistor is increased, the resistivity increases and conductivity decreases. Hence, both the conductivity and resistivity of the metallic resistor nullify the effect of the change in temperature.

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Statement- 1 :

Conductivity of a metallic conductor decreases with increase in temperature.

Statement- 2 :

On increasing temperature the number of free electrons in the metallic conductor decreases.

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