1. Alpha particles (charge = +2e, mass = 6.68 x 10-27 kg) are accelerated in acyclotron to a final orbit radius of 0.90 m. The magnetic field in the cyclotron is 0.20 T.The period of circular motion of the alpha particles is closest to: *a. 0.65µsb. 1.0µsc. 1.3µsd. 1.6µse. 2.0µsGeneral Feedback:The radius is given bymvRqB=The period can be found from the tangential speed and the circumfernce2rvTπ=Substituting7226.510mRRqBTmTsqBππ−===×2. If you were to cut a small permanent bar magnet in half, a. one piece would be a magnetic north pole and the other piece would be asouth pole. b. neither piece would be magnetic. *c. each piece would in itself be a smaller bar magnet with both north and southpoles. d. each piece would contain both north and south poles, but on a given piecethe intensity of the north and south poles would not necessarily be equal. e. None of these statements is true. 3. Which of the following is an accurate statement? *c. The magnetic force on a moving charge does not change its energy.
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