NEET Physics Current Electricity Questions Solved

PMT - 1992

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) mlne2τA

(2) mτ2Ane2l

(3) ne2τA2ml

(4) ne2A2mτl 

(1) R=ρlA=nne2τ.lA   

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