defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Physics Current, Resistance and Electricity Resistance and Resistivity
A current of 10 A exists in a wire of a cross-sectional area of 5 mm2 with a drift velocity of 2 × 10-3 ms-1. The number of free electrons in each cubic meter of the wire is ________.
1
2 × 106
2
1 × 1023
3
625 × 1025
4
2 × 1025