An electron (charge $= 1.6 × 10^{-19}$ coulomb) is moving in a circle of radius $5.1 × 10^{-11}\,m$ at a frequency of $6.8 × 10^{15} $ revolutions/sec. The equivalent current is approximately
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(c) $i = e\nu = 1.6 \times {10^{ - 19}} \times 6.8 \times {10^{15}} = 1.1 \times {10^{ - 3}}\,amp$
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