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Example 4.3 What is the radius of the path of an electron (mass9x 10 kg and charge 1.6 x 10-19 C) moving at a speed of 3 x10 m/s ina magnetic field of 6 x 10-4 T perpendicular to it? What is itsfrequency? Calculate its energy in keV. (1 eV = 1.6 X 10J).

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