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An alpha particle (the nucleus of a helium atom) consists of two protons and two
neutrons, and has a mass of 6.64x1027kg. A horizontal bean of alpha particles is
injected with a speed of 1.3x105m/s into a region with a vertical magnetic field of
magnitude of 0.155T.
a) What is the radius of the path the alpha particles make in the field?
b) How long does it take for the alpha particles to move halfway through a
complete circle?

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