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  4. An electron revolves in a circle at the rate of 1019 rounds per second. The equivalent current is (e=1.6× 10-19C)

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Q. An electron revolves in a circle at the rate of $10^{19}$ rounds per second. The equivalent current is $(e=1.6\times 10^{-19}C)$

J & K CETJ & K CET 2013Moving Charges and Magnetism

Solution:

Current $I=e f$
Given, $e=1.6 \times 10^{-19} C$ and $f=10^{19}$
$\therefore I=1.6\, A$