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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The magnetic materials exhibit the property of magnetisation because of

spin of nucleus
orbital motion of electrons
spin of electrons
either of these

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Magnetism and Electromagnetism
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be

Zero
BLI2
None of the listed here
BLI

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Magnetism and Electromagnetism
A permeable substance is one

Which is a good conductor
Which is a bad conductor
Through which the magnetic lines of force can pass very easily
Which is a strong magnet

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Magnetism and Electromagnetism
The use of permanent magnets is. not made in

Loud speakers
None of the listed here
Energy meters
Transformers

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Magnetism and Electromagnetism
The retentivity of material is useful for the construction of

Permanent magnets
Electromagnets
Transformers
Non-magnetic substances

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

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

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