NEET Physics Current Electricity Questions Solved

If n, e, τ and m respectively represent the density, charge relaxation time and mass of the electron, then the resistance of a wire of length l and area of cross-section A will be 

(1) $\frac{ml}{n{e}^2\tau A}$

(2) $\frac{m{\tau }^{2}A}{n{e}^{2}l}$

(3) $\frac{n{e}^2\tau A}{2ml}$

(4) $\frac{n{e}^{2}A}{2m\tau l}$