railway RRB Technician Grade 1 Mock Test 2024 Physics Current, Resistance and Electricity Resistance and Resistivity
A current of 2.0 A flows down a straight metal rod that has a 0.20 cm diameter. The rod is 2.0 m long, and the potential difference between its ends is 40 V. The resistivity of the material of the rod will be :
1
125.6 μΩ m
2
62.8 μΩ m
3
31.4 μΩ m
4
15.7 μΩ m