20 - 1 Lu ECE331 Final Exam Schedule Final Exam: 6/3/2008...

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Unformatted text preview: 1 Lu ECE331 Final Exam Schedule Final Exam: 6/3/2008 (Tuesday), 1:30 to 3:18pm Office Hours on 6/2/2008 (Monday): 10:30 to 12, 1:30 to 3:30 Lu ECE331 Magnetic Properties of Materials Why study this? Many devices rely on magnetism and magnetic materials. Power generators, transformers, motors, radio, TV, antenna, disks and CDs, 2 Lu ECE331 Basic Concepts 1. Magnetic Forces Generated by moving electrically charged particles (in addition to any electrostatic forces) Magnetic Dipoles Magnetic field strength (H) For cylindrical coil, l, length, N, turns, I, current l NI H = Lu ECE331 Basic Concepts Magnetic induction (magnetic flux density, B, tesla) Represents the magnitude of the internal field strength within a material that is subjected to an H field. B = H is the permeability (H/m), a material parameter. r = / , relative permeability ,permeability in vacuum, 4 X10-7 H/m 3 Lu ECE331 Basic Concepts Magnetization (M) Magnetic moments in a material align with the applied field....
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20 - 1 Lu ECE331 Final Exam Schedule Final Exam: 6/3/2008...

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