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exam2Solution05

# exam2Solution05 - Alpha particles(charge = 2e mass = 6.68 x...

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1. Alpha particles (charge = +2e, mass = 6.68 x 10 -27 kg) are accelerated in a cyclotron 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. 0.65 µ s b. 1.0 µ s c. 1.3 µ s d. 1.6 µ s e. 2.0 µ s General Feedback: The radius is given by mv R qB = The period can be found from the tangential speed and the circumfernce 2 r v T π = Substituting 7 2 2 6.5 10 m R R qBT m T s qB π π = = = × 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 a south pole. b. neither piece would be magnetic. *c. each piece would in itself be a smaller bar magnet with both north and south poles. d. each piece would contain both north and south poles, but on a given piece the 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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