defence exam Army Havildar SAC Mock Test Series 2025 Physics Current, Resistance and Electricity Current Density
If 'E' is the magnitude of a uniform electric field in a conductor, 'τ' is the relaxation time and 'n' is the number of free electrons per unit volume in the conductor ('e' is charge and 'm' is mass of an electron) then, the term ne2Eτ/m is equal to the ______________
1
conductivity
2
resistivity
3
current density
4
permittivity