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Q.

The resistivity (specific resistance) of a copper wire 

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a

decreases with increase in its cross-section

b

increases with increase in its length

c

increases with increase in its temperature

d

increases with increase in its cross-section

answer is A.

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Detailed Solution

Resistivity of copper wire increases with increase in temprature as ρt=ρ0(1+αt)

Copper being a metal has positive coefficient of resistivity. 

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The resistivity (specific resistance) of a copper wire