The potential difference between the ends of a straight conductor of length $20 \ cm$ is $16 \ V$. If the drift speed of the electrons is $2.4 \times 10^{-4} \ ms^{-1}$,the electron mobility in $m^2 \ V^{-1} \ s^{-1}$ is

  • A
    $3.6 \times 10^{-6}$
  • B
    $2.4 \times 10^{-6}$
  • C
    $2 \times 10^{-6}$
  • D
    $3 \times 10^{-6}$

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