Round and round

If an electron revolves in the path of a circle of radius of 0.5 × 1 0 10 m 0.5\times10^{-10} \text{ m} at a frequency of 5 × 1 0 15 5\times 10^{15} cycles per second, then find the electric current in the circle.

None of these above 1 mA 0.5 mA 0.8 mA

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