Physics 9702 · AS & A Level · Electric current

Electric current — practice question

Two metal plates are separated by a distance of $30\,\text{cm}$ in a vacuum. A current flows between the plates because electrons move at a steady speed of $1.5 \times 10^{6}\,\text{m s}^{-1}$. At every moment, only one electron is present in transit between the plates. What is the current between the plates?

  • A$3.2 \times 10^{-26}\,\text{A}$
  • B$8.0 \times 10^{-13}\,\text{A}$
  • C$1.6 \times 10^{-12}\,\text{A}$
  • D$2.0 \times 10^{-7}\,\text{A}$

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