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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The susceptibility of paramagnetic materials generally lies between

KT4 and KT8
1CT3 and 1CT7
KT3 and 1CT6
10"2 and KT5

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Magnetism and Electromagnetism
Magnetism of a magnet can be destroyed by

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

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Magnetism and Electromagnetism
A keeper is used to

Provide a closed path for flux
Change the direction of magnetic lines
Amplify flux
Restore lost flux

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Magnetism and Electromagnetism
Degaussing is the process of

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

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

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

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

little
zero
higher
lower

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