Show that a charged particle flying into a strong uniform magnetic field is reflected specularly if its speed is less than a certain limit (the “magnetic mirror” principle, Fig. 28.20). Find the kinetic energy of electrons experiencing specular reflection if the electron beam moves perpendicular to the “magnetic mirror”. A magnetic field with induction B = 0.1 T is created in a large region of space, the thickness of the “magnetic mirror” is d = 10 cm.

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