Questions
If a copper wire is stretched to make it 0.1% longer, the percentage increase in resistance will be
detailed solution
Correct option is A
R=ρlA=ρl2Al or R∝l2 for such small percentage changes ∆RR×100=2∆LL×100(∴ Volume A l remains same)Talk 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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