Questions
If a wire is stretched such that its area of cross-section becomes (1 / n) times, then its resistance will became
detailed solution
Correct option is B
we know that R=ρlA∴ R=ρVA2 or R∝1A2∴ R1R2=A2A12=AnA2=1n2or R2=n2R1Talk to our academic expert!
Similar Questions
In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω . The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3 mm . Now the total resistance of the cable will be
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