An a-particle has a charge of +2e and a mass of 6.64 × 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.99 x 106 V and then enters a uniform magnetic field whose magnitude is 2.94 T. The a-particle moves perpendicular to the magnetic field at all times. What is (a) the speed of the a-particle, (b) the magnitude of the| magnetic force on it, and (c) the radius of its circular path? Parallel plate capacitor B (into screen) VA A. B. C. arch O 4* a (7 近 +++ +

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