If an electron revolves in the path of a circle of radius of $0.5 × 10^{-10}\, m$ at frequency of $5 × 10^{15}$ $cycles/s$ the electric current in the circle is ..................$mA$ (Charge of an electron $=1.6 × 10^{-19}\, C$ )
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(b) $i = \frac{Q}{T} = Q\nu = 1.6 \times {10^{ - 19}} \times 5 \times {10^{15}} = 0.8\,mA$.
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