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Magnetism and Electromagnetism

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

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

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Magnetism and Electromagnetism
Degaussing is the process of

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

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Magnetism and Electromagnetism
Magnetism of a magnet can be destroyed by

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

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

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

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

None of the listed here
Ferromagnetic
Dielectric
Diamagnetic

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Magnetism and Electromagnetism
An electromagnetic field exists only when there is

current
decreasing current
voltage
an increasing current

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MORE MCQ ON Magnetism and Electromagnetism

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