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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The unit for reluctance is

At/Wb
Wb
tesla
At/m

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Magnetism and Electromagnetism
Degaussing is the process of

Remagnetising metallic parts
Removing gases from the materials
Demagnetising metallic parts
Removal of magnetic impurities

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Magnetism and Electromagnetism
For which of the following materials the saturation value is the highest?

Diamagnetic materials
Ferrites
Paramagnetic materials
Ferromagnetic materials

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Magnetism and Electromagnetism
An electromagnetic field exists only when there is

decreasing current
voltage
an increasing current
current

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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?

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

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Magnetism and Electromagnetism
When a solenoid is activated, the force that moves the plunger is

an electromagnetic field
a steady current
varying voltage
a permanent magnetic field

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MORE MCQ ON Magnetism and Electromagnetism

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