Question

the resistance of a wire is R ohms. if its melted and stretched to 'n' times its original length,its new resistance will be ______

Answer 1

R is proportional to A/l. multuply above and below by l...to get R proportional to AL/L² so now if L is changed to nL so the new resistance becomes R'=R/n²... sincle AL that is volume is constant

Answer 2

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