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If n ,e,m and tau are free electron den...

If n ,e,m and `tau` are free electron density in conductor , charge of electron, mass of electron and relaxation time of free electrons , then resistivity `rho` of the conductor can be expressed as

A

`rho = ( m )/ ( n e^(2) tau ) `

B

` rho = ( n e^(2) tau )/( m ) `

C

` ( rho = ( n e tau )/( m ) `

D

` rho = ( m )/( n e tau ) `

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