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exam1 - EE321 Exam 1 Spring 2006 Name Student ID 1 2 3 4 5...

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EE321 Exam 1 Spring 2006 Name: Student ID:
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1.) 2 pts. What is meant by relative permeability? 2.) 2 pts. What are symbols and units for flux density and field intensity? 3.) 2 pts. In what kind of material is the magnetic moment of adjacent atoms anti- parallel but unequal? 4.) 3 pts. What is the dominant physical effect which causes a coupling field not to be conservative? 5.) 3 pts. Could the following systems of flux linkage equations correspond to a physical device with a conservative field? 2 1 2 2 1 1 3 6 7 5 i i i i + = + = λ λ 7.) 3 pts. You are given complicated expressions for current in terms of flux linkage. You need to find force. Would you compute field energy or co-energy ? 8.) 10 pts. The flux linkage equation of a coil is given by 2 20 i = λ At a current of 1 A, what are the absolute and incremental inductances? 9.) 10 pts. You are shopping for groceries. I kind elderly woman approaches you and asks, “Pardon me Sir, (or Miss, as the case may be), could you help me something?
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