ENGRI_111_hw5_2007

ENGRI_111_hw5_2007 - physical meaning of all distinctive...

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ENGRI 111 Homework #5 Due Friday, Nov. 2, 2007 1. Write concise answers for the following questions regarding magnetic moments: a. What are the two sources of magnetic moments for electrons? Why? b. Do all electrons have a net magnetic moment? Why or why not? c. Do all atoms have a net magnetic moment? Why or why not? 2. Briefly explain why ferromagnetic behavior ceases above the Curie temperature. 3. Sketch a standard generic plot of the magnetization, M, versus magnetic field, H, for a ferromagnetic material. Explain the overall shape of the plot and the
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Unformatted text preview: physical meaning of all distinctive features (maxima, minima, x and y intercepts, width and height of loop), and highlight these features on your sketch. 4. Describe the materials requirements for: a. Magnetic data storage tape b. Magnetic read/write head 5. What are the forces that act on particles in a ferrofluid? Why is there a size constraint on particles in a ferrofluid? Explain the approaches that have been taken to keep these particles from aggregating....
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