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Magnetism and Electromagnetism

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?

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

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Magnetism and Electromagnetism
Ferrites are materials.

Diamagnetic
Ferromagnetic
None of the listed here
Paramagnetic

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Magnetism and Electromagnetism
Tesla is a unit of

Field strength
Flux density
Flux
Inductance

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

2.4 At
2,400 At
240 At
24 At

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

equal to unity
equal to that ferromagnetic mate rials
slightly more than unity
slightly less than unity

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Magnetism and Electromagnetism
The change of cross-sectional area of conductor in magnetic field will affect

both of the listed here
None of these
resistance of conductor
reluctance of conductor

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