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MHT CET Physics question

PhysicsCurrent ElectricityMHT CET

A wire 1m long has a resistance of . if it is uniformly stretched, so that its length increases by 25 % then its resistance will increases by

Answer: (C)

Solution

For constant volume R ∝ l², so R′ = (1.25)² × 1 = , an increase of = 56.25

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Question ID VK-044921