Year: 2017
Topic: Current electricity
Time :
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
(1). \(\displaystyle \frac{R}{M}\)
(2). \(\displaystyle n^2\,R\)
(3). \(\displaystyle \frac{R}{n^2}\)
(4). \(nR\)