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Unformatted text preview: EE321 Exam 1A Spring 2004 Name: Student ID: Instructions: Work ALL Basic Problems. Work three out of the four Challenge Problems. Circle the problem number of those you want graded. Otherwise, we’ll grade the first 3. Basic Problem 1 (11 pts) – MMF Drop In this problem, we will specify coordinates in the form (x,y,z). Suppose an H- field of 100 A/m exists in the positive x direction. What is the MMF drop from the point (1,2,4) to the point (6,4,2). Basic Problem 2 (12 pts) – Reluctance A magnetic material is to carry a flux of 0.01 Wb. If the material saturates at 0.5 T, what is the minimum cross section that can be used ? If the piece is 5 cm long, the minimum cross section is used, and the relative permeability is 2000, what will be the reluctance ? Basic Problem 3 (12 pts) – Mutual Inductance Consider the MEC below. Therein, 1 4 2 1 10 − = = H R R , 1 5 3 10 − = H R , 50 1 = N , and 100 2 = N . Find the mutual inductance between the two windings....
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- Spring '08
- Magnetism, Magnetic Field, pts, Basic Problem