An electron moves in a circle of radius `pi` can with uniform speed `5 xx 10^6 m//sec`. Find the electric current at point on the circle. (Take `pi^2 = 10`).

Explanation

Time-period `T = (2 pi r)/(v)`
`i = (q)/(T) = (e)/(2 pi r//v) = (ev)/(2 pi r)`
=`(1.6 xx 10^-19 xx 5 xx 10^6)/(2 pi xx pi xx 10^-2)`
=`4 xx 10^-12 A`.
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