NEET Physics Resistance & Resistivity MCQ Question
A copper wire has a resistance of 10 Ω at room temperature. If the length of the wire is doubled and the cross-sectional area is halved, what will be the new resistance of the wire?
40 Ω
20 Ω
80 Ω
10 Ω
Correct Answer
Detailed Explanation
The resistance R of a conductor depends on its length l and cross-sectional area A through the relation R = ρ(l/A). Doubling the length and halving the area increases the resistance by a factor of 4.
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