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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The materials are a bit inferior conductors of magnetic flux than air.

Dielectric
None of the listed here
Ferromagnetic
Diamagnetic

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Magnetism and Electromagnetism
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?

25 AT/m
0.25 AT/m
2500 AT/m
250 AT/m

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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

0.01 N
100 N
0.1 N
10 N

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Magnetism and Electromagnetism
An electromagnetic field exists only when there is

current
decreasing current
an increasing current
voltage

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Magnetism and Electromagnetism
Air gap has_______eluctance as compared to iron or steel path

lower
higher
little
zero

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

3 AT
30 AT
300 AT
0.3 AT

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