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Drift Velocity

Assertion :Th...

Question

Assertion :The kinetic energy of electrons in a metallic wire will increase, if the temperature of the wire is increased. Reason: On increasing temperature, conductivity of metallic wire decreases.

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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C

Assertion is correct but Reason is incorrect

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D

Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
On increasing temperature of wire the kinetic energy of free electrons increase and so they collide more rapidly with each other.
This has inhibit their drift velocity and the relaxation time also decreases.
Also when temperature increases, resistance increase and resistance is inversely proportional to conductivity of material,due to above mentioned reason.

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