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Magnetism and Electromagnetism

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

Copper
Brass
Ebolite
Zinc

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Magnetism and Electromagnetism
If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

None of the listed here
Increase
Is zero
Decrease

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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?

300 At
18.75 At
30 At
187 At

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Magnetism and Electromagnetism
Magnetism of a magnet can be destroyed by

Heating
All of the listed here
Hammering
By inductive action of another magnet

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Magnetism and Electromagnetism
Temporary magnets are used in

Loud speakers
All of the listed here
Motors
Generators

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Magnetism and Electromagnetism
What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10–3 m2?

91.7 T
91 T
917 T
9.7 T

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