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The resistivity (specific resistance) of a copper wire:

1. increases with increase in its temperature
2. decreases with increase in its cross-section
3. increases with increase in its length
4. increases with increase in its cross-section

Correct answer: increases with increase in its temperature

Solution

The resistivity of a material is an intrinsic property and depends only on the material and its temperature. For copper, resistivity increases with an increase in temperature due to increased lattice vibrations, which hinder electron flow.

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