Solution to task 441 from Chertov's for extramural stud

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• The proton flew into the magnetic (B = 50 mT) and electric (E = 20 kV / m) fields crossed at an angle α = 120 °. Determine the acceleration a * of the proton if its velocity v (| v | = 4.105 m / s) is perpendicular to the vectors E and B.