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A beam of electrons whose kinetic energy...

A beam of electrons whose kinetic energy is K emerges from a thin-foil "window" at end of an accelerator tube. A metal plate at distance d from this window is perpendicular to the direction of the emerging beam. (a) Show that we can prevent the beam from hitting the plate if we apply a uniform magnetic field such that
`Bgesqrt((2mK)/(e^(2)d^(2))`
in which m and e are the electrons mass and charge
(b) How should `vecB` be oriented?

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