problems_section_10[1]

problems_section_10[1] - Problems – Magnetic Materials 1...

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Problems – Magnetic Materials 1. Suppose a design is needed for a solenoid that will develop a magnetic field of 10 kA/m when powered with 1A in vacuum. The solenoid dimensions are 0.3m in length and 2 cm in diameter. a. How many turns of wire are required? b. If the solenoid is wound with 0.5 mm diameter copper wire, what dc voltage is required to power it? 2. Explain the physical difference between magnetization M and induction B. 3. (A) Sketch a well-labeled B-H diagram characteristic of a ferromagnetic material at 0 K. Indicate the saturation induction, the remnant induction, and the coercive field. (B) Briefly describe how the area of the hysteresis loop changes as the temperature approaches the Curie temperature. Briefly justify your answer. 4. Problem M-3 in Fischer: Schematically sketch the hysteresis loop for a ferromagnet at a temperature close to 0 K, just below the Curie temperature, and just above the Curie temperature. Briefly explain why these curves are different. 5. The B-H curve for a hard ferromagnet can be described by the adjacent figure (M1a). a. What is the total hysteresis energy loss per cycle? b. What is the BH max product? 6. The B-H curve for a hard ferromagnet outlines the parallelogram of figure M1b. a. What is the total hysteresis energy loss per cycle?
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This note was uploaded on 10/03/2009 for the course E e 344l taught by Professor Libera during the Spring '09 term at Stevens.

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problems_section_10[1] - Problems – Magnetic Materials 1...

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