Give relation between drift velocity and electric field.
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We know, `I= n e A v_(d)` or `I//A = n e v_(d)` [`:' I//A=J`] or `J= n e v_(d)" "[:' sigma = ("current density(J)")/("electric field(E)")]` or `sigma E= n e v_(d) or E = (n ev_(d))/(sigma) = n e rho v_(d)" "[:' 1/sigma = rho = "resistivity"]`
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