railway RRB Technician Grade 1 Mock Test 2024 Physics Current, Resistance and Electricity Resistance and Resistivity
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
\(\frac{R}{n^{2}}\)
2
nR
3
\(\frac{R}{n}\)
4
n2R