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An electron having a kinetic energy of 100eV circulates in a path of radius 10cm in a magnetic field. Find the magnetic field and the number of revolutions per second made by the electron.

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KE = 100ev = 1.6 × 10–17J

(1/2) × 9.1 × 10–31 × V2 = 1.6 × 10–17J

=> V2 = (1.6 x 10-17 x 2)/(9.1 x 10-31) = 0.35 x 1014

or, V = 0.591 × 107m/s

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