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Conductivity and Resistivity

The specific ...

Question

The specific resistance of a conductor increases with ...

A

Increase in temperature

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B

Increase in cross-sectional area

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C

Decrease in length

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D

Decrease in cross-sectional area

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Solution

The correct option is A Increase in temperature
Specific resistance or resistivity is a constant. This quantity is independent of the dimensions of the conductor. This quantity directly proportional to the temperature of the conductor. Hence, resistivity increases with increase in temperature.
Note: Dependence of resistivity over temperature is different for conductor, semiconductor and insulators.

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Similar questions

Q. Assertion :The resistance of a conductor decreases with increase in cross-sectional area. Reason: On increasing the cross-sectional area of a conductor, more current will flow through the conductor.

Q. "The resistance of any conductor is directly proportional to length and inversely proportional to area of cross-section of the substance" from this is concluded that ____________.
P: Value of resistance increases with increase in the length of conductor.
Q: Value of resistance decreases with increases in the length of conductor.
R: Value of resistance decreases with increase in the area of cross-section.
S: Value of resistance decreases with decrease in area of cross-section.

Q. If the area of cross-section of a conductor is increased, the resistance offered by the conductor will also increase.

Q. We know that current

I = n e A V_{d}

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Q. If length of a wire increases by

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