Q.

Resistance of a copper wire

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a

Increases if the sample is stretched

b

Increases if impurity is added to it.

c

Increases if the temperature of the specimen is increased.

d

All of the above are correct.

answer is D.

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Detailed Solution

In all of the above cases mean free path of free electrons decreases. So the free electrons make more number of collisions with ionic cores and hence resistance increases. 

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Resistance of a copper wire