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A magnetic field with induction B = 15 · 10−4T is directed perpendicular to the electric...

A magnetic field with induction B = 15 · 10−4T is directed perpendicular to the electric field with intensity E = 10V /cm. The beam of electrons flying at the speed v enters the space with the mentioned fields. The velocity of the electrons is perpendicular to the plane containing the vectors E and B. Calculate: 1) the electron velocity v, if the electron beam does not deviate under the simultaneous action of both fields; 2) the radius of curvature of the electron trajectory when only the magnetic field is on. 3) What is the kinetic energy of the electron in both cases?

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