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Which of the following graph represents the variation of resistivity (ρ) with temperature (T) for copper?

1. ρ vs T graph (downward curve)
2. ρ vs T graph (linear downward slope)
3. ρ vs T graph (linear upward slope)
4. ρ vs T graph (upward curve)

Correct answer: ρ vs T graph (linear upward slope)

Solution

For metals like copper, resistivity increases linearly with temperature due to increased scattering of electrons by lattice vibrations.

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