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If $n, e, \tau$ and $m$ are representing electron density, charge, relaxation time and mass of an electron respectively, then the resistance of a wire of length / and cross-sectional area $A$ is given by
  • A$\frac{m l}{n e^2 \tau A}$
  • B$\frac{m \tau A}{n e^2 I}$
  • C$\frac{n e^2 \tau A}{m l}$
  • D$\frac{n e^2 A}{m \tau I}$
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