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) R/n
(b) n2/R
(c) R/N2
(d) nR
Correct option (b) n2/R
Explanation:
The resistance of a wire of length l and area A and resistivity ρ is given as
