The potential difference applied to an $X$-ray tube is $5 \text{ kV}$ and the current through it is $3.2 \text{ mA}$. Then the number of electrons striking the target per second is

  • A
    $2 \times 10^{16}$
  • B
    $5 \times 10^{16}$
  • C
    $1 \times 10^{17}$
  • D
    $4 \times 10^{15}$

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