1) The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length. its new resistance will be A) Rn B) n2R C) Rn2 D) nR Answer: Option BExplanation:we know that, R = ρlA or R = ρl2Volume → R∝l2 According to question l2=nl1 R2R1=n2l21l21 or R2R1=n2 R2=n2R1