The charge of an electron is $1.6 \times 10^{-19} \ C$. How many electrons strike the screen of a cathode ray tube each second when the beam current is $16 \ mA$?

  • A
    $10^{17}$
  • B
    $10^{19}$
  • C
    $10^{-19}$
  • D
    $10^{-17}$

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