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The resistivity of a copper wire grows with rising temperature according to the relation ρt = ρ0(1+αt). Since copper is a metal, it has a positive temperature coefficient of resistivity.

1. Resistivity reduces as temperature rises
2. Resistivity grows as temperature rises
3. Resistivity stays unchanged with temperature
4. Resistivity reduces as temperature decreases

Correct answer: Resistivity grows as temperature rises

Solution

For metals like copper, the resistivity increases with temperature due to the positive temperature coefficient of resistivity, as described by the given formula.

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