Which graph represents the variation of resistivity (ρ) with temperature (T) for copper? [Diagram: Image]
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Which graph represents the variation of resistivity (ρ) with temperature (T) for copper? [Diagram: Image]

G1 Physics · Accepted Answer

Step 1: For a metal over a moderate temperature range, resistivity ρ(T) ≈ ρ₀[1+α(T−T₀)] with α > 0. Step 2: Hence ρ increases approximately linearly with T, corresponding to the upward straight line.