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An α-particle has a charge of +2e and a mass of 6.64 × 10-27 kg. It...

An α-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 1.71 × 106 V and then enters a uniform magnetic field whose magnitude is 1.54 T. The α-particle moves perpendicular to the magnetic field at all times. What is (a) the speed of the α-particle, (b) the magnitude of the magnetic force on it, and (c) the radius of its circular path?

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