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A beam of electrons with a velocity of 3.2 x 10 7 m/s is fired...

A beam of electrons with a velocity of 3.2 x 10
7 m/s is fired into a uniform magnetic field which
has a flux density of 8.5mT. The initial velocity is perpendicular to the field.
Explain why the electrons move in a circular orbit. Calculate the radius of the orbit.
What must the flux density be adjusted to if the radius of the orbit is desired to be 65mm?

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