a-Particle flies normally into the region of a transverse uniform magnetic field with induction B = 0.1 T (Fig.). The size of the area is h = 0.2 m. Find the speed of the particle if, after passing through the magnetic field, it deviates by an angle φ = 30° from the original direction. The ratio of the charge of an alpha particle to its mass is q/m = 0.5 • 108 C/kg.
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