A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively:
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A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively:

G1 Physics · Accepted Answer

Step 1: Resistivity ρ is a material property; neglecting temperature change, it stays constant. Step 2: Volume conservation gives R ∝ L². Step 3: R′/R = (1.1)² = 1.21, whereas ρ′/ρ = 1.