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Magnetic Circuit

Magnetic Circuit
Relative permeability of vacuum is

6
3
1
5

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

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

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Magnetic Circuit
Energy stored by a coil is doubled when its current is increased by percent.

44.6
41.4
42.5
47.5

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Magnetic Circuit
The unit of reluctance is

1/Henry
Henry
Meter/Henry
Henry/meter

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Magnetic Circuit
The unit of retentivity is

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

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Magnetic Circuit
Hard steel is suitable for making permanent magnets because

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

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