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An electron moves with a velocity, v = ( 4i + 2 j)x106 m/s in a...

An electron moves with a velocity, v = ( 4i + 2 j)x106 m/s in a region where there is a uniform magnetic field, B = (0.5 j) T. (a) Find the magnitude and direction of the force acting on the electron as it enters into the magnetic field.(b) Find the pitch of the helical motion. (c) What is the work done by the magnetic force during 1 cycle of the motion? (e = - 1.6x10-19 C, me = 9.10 x10-31 kg).

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