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Magnetic Circuit

Magnetic Circuit
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be

Small
Large
None of the listed here
Zero

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Magnetic Circuit
Hard steel is suitable for making permanent magnets because

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

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

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

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Magnetic Circuit
A material for good magnetic memory should have

Low retentivity
Low hysteresis loss
High retentivity
High permeability

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Magnetic Circuit
Permeability in a magnetic circuit corresponds to_________ in an electric circuit.

Conductivity
Conductance
Resistivity
Resistance

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Magnetic Circuit
The unit of retentivity is

Weber/sq. m
Ampere turns
Ampere turn/meter
Weber

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