A cathode emits $1.8 \times {10^{14}}$ electrons per second, when heated. When $ 400\;V$  is applied to anode all the emitted electrons reach the anode. The charge on electron is $1.6 \times {10^{ - 19}}\;C$. The maximum anode current is ............ $\mu A$

  • A

    $2.7$

  • B

    $29$

  • C

    $72$

  • D

    $2.9$

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