GUIDED PRACTICE PROBLEM 11.3 Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. These cyclotrons typically accelerate H- (the hydride ion, which has one proton and two electrons) to an energy of 5 MeV to 20 MeV. A typical magnetic field in such cyclotrons is 2T. (a) What is the speed of a 10MEV H-? (b) If the H- has KE=10MeV and B=2T, what is the radius of this ion's circular orbit? (eV is electron- volts, a unit of energy; 1 eV=0.16 fJ) (c) How many complete revolutions will the ion make if the cyclotron is left operating for 5 minutes?

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Bar Magnet

In physics, magnetism is a phenomenon exhibited by a magnetic substance that exerts either attractive or repulsive force. A bar magnet is either a rectangular or round and hollow fit comprised of ferromagnetic materials and has a fanciful attractive field surrounded by it.