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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A beam of electrons whose kinetic energy is K emerges from a thin-foil window at the end of an accelerator tube. A metal plate at distance d from this window is perpendicular to the direction of the emerging beam (see figure). We can prevent the beam from hitting the plate if we apply a uniform magnetic field such that B≥e 2 d 2 2 mK in which m and e are the electron mass and charge. How should B be oriented?

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

A proton of charge e and mass m enters a uniform magnetic field B= B i ^ with an initial velocity v =v x ​i ^+v y j ^. Find an expression in unit-vector notation for its velocity at time t.