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Unformatted text preview: π cm 2 . It is wrapped uniformly with 7500 turns of wire carrying a current of 14 A. a) What is the magnetic f eld inside the toroid at r = 20 cm? b) What is the magnetic f eld in the toroid if it is f lled with iron of permeability 500? [5] A certain cyclotron with magnetic f eld 1.8T is designed to accelerate protons to 25 MeV. a: What is the cyclotron frequency? b: What must be the minimum radius of the magnet to achieve a 25 MeV emergence energy? c: If the alternating potential applied to the dees has a maximum value of 50 kV, how many revolutions must the protons make before emerging with an energy of 25 MeV? [6] A straight wire segment −→ l = ³ 3 b i + 4 b j ´ cm carries a current of +2.5 A. If the wire is in a uniform magnetic f eld −→ B = 2 . 5 b i T, f nd the force on the wire. 1...
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 Spring '08
 Jordan
 Current, Work, Magnetic Field, 1%, 2 mM, 20 cm, 32 cm, 0.7 G

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