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Unformatted text preview: HW-9 1.Starting from the Lorentz force law, show that the torque on any steady current loop in a uniform magnetic field is Bm. Hint: CBABCACBA)()()(AldrldrA21)(for any constant vector A. 2.In infinite long circular cylinder carries a uniform magnetization Mparallel to its axis. Find the magnetic field Band Hinside and outside the cylinder. 3.A long circular cylinder of radius R carries a magnetization ekrM2, where k is a constant, r is the distance from the axis, and eis the usual azimuthal unit vector. Find the Band Hinside and outside the cylinder. 4.Eletromagnet is usually designed by rapping electro wires over a U shape core made of high permeability (>>1) material (see figure below). If the total length of the core material is Land there are a total of N turns of the wire over the core, what is the magnetic field B within the gap of the U magnet? the gap of the U magnet?...
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This note was uploaded on 02/06/2010 for the course PHYSICS 11 taught by Professor Qiu during the Fall '09 term at University of California, Berkeley.
- Fall '09