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Magnetic Circuit

Magnetic Circuit
Reciprocal of reluctance is

Reluctivity
Permeance
Permeability
Susceptibility

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Magnetic Circuit
Hard steel is suitable for making permanent magnets because

Its mechanical strength is high
Its hysteresis loop has large area
It has good residual magnetism
Its mechanical strength is low

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Magnetic Circuit
Laminated cores, in electrical machines, are used to reduce

All of the listed here
Hysteresis loss
Eddy current loss
Copper loss

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Magnetic Circuit
In a magnetic material hysteresis loss takes place primarily due to

Rapid reversals of its magnetization
Flux density lagging behind magnetizing force
Molecular friction
It high retentivity

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Magnetic Circuit
An air gap is usually inserted in magnetic circuits to

None of the listed here
Increase the flux
Prevent saturation
Increase m.m.f.

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Magnetic Circuit
Ferrites have high hysteresis

Ferrites have low permeability
Ferrites have high resistance
Ferrites have high resistance
None of the listed here

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