Two wires have their lengths, diameters and resistivities all in the ratio of 1: 2 If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is:
✓ Correct answer: c) 20 ohm
ExplanationOption (b) is correct: Resistance (R) of a length l, resistivity r and area of cross-section A is given by l R A = ρ For the two wires, Therefore, the resistance of the thicker wire is 10 Ω.276
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