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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

2,400 At
240 At
24 At
2.4 At

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Magnetism and Electromagnetism
Which of the following is expected to have the maximum permeability ?

Zinc
Ebolite
Brass
Copper

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Magnetism and Electromagnetism
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be

100 N
0.1 N
0.01 N
10 N

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Magnetism and Electromagnetism
The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

31.25 V
3,125 V
1,000 V
2,000 V

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Magnetism and Electromagnetism
Materials subjected to rapid reversal of magnetism should have

High permeability and low hysteresis loss
High co-ercivity and low density
Large area of B-H loop
High co-ercivity and high retentivity

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Magnetism and Electromagnetism
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

30 At
300 At
187 At
18.75 At

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