If an electron revolves in the path of radius of 0.5 * 10 ^-10m at a frequency of 5 * 10 ^15 cycles s^-1 ,then find the electric current in the circle.

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Solution

As we know current for electron revolving in a circle is = ev/(2 pie r) v/r = angular speed =2 pie x frequency = 2 pie x 5 x 10^15 radian/s so substituting v/r in formula we get: I = e2 pie x 5 x 10^15/ 2pie = e x 5 x 10^15 I = 1.6 x 10^(-19) x 5 x 10^15 I = 8 x 10^(-4) A

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