An electron (charge $= 1.6 \times 10^{-19} \text{ C}$) is moving in a circle of radius $5.1 \times 10^{-11} \text{ m}$ at a frequency of $6.8 \times 10^{15} \text{ rev/s}$. The equivalent current is approximately:
- A$5.1 \times 10^{-3} \text{ A}$
- B$6.8 \times 10^{-3} \text{ A}$
- C$1.1 \times 10^{-3} \text{ A}$
- D$2.2 \times 10^{-3} \text{ A}$
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