Current per unit area called current density (j) is equal to? (Where 'e' is charge on an electron, 'σ' is conductivity, 'm' is mass of an electron, 'E' is theelectric field, 'τ' is relaxation time and 'n' is the number of free electrons per unit volume of a metallic conductor)

Current per unit area called current density (j) is equal to? (Where '

1.	Current per unit area called current density (j) is equal to? (Where 'e' is charge on an electron, 'σ' is conductivity, 'm' is mass of an electron, 'E' is theelectric field, 'τ' is relaxation time and 'n' is the number of free electrons per unit volume of a metallic conductor)
A.	ne2τE
B.	ne2τ/m
C.	σE
D.	eτ/ m
Answer» D. eτ/ m

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Current per unit area called current density (j) is equal to? (Where 'e' is charge on an electron, 'σ' is conductivity, 'm' is mass of an electron, 'E' is theelectric field, 'τ' is relaxation time and 'n' is the number of free electrons per unit volume of a metallic conductor)

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