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Magnetic Circuit

Magnetic Circuit
Reciprocal of reluctance is

Reluctivity
Susceptibility
Permeability
Permeance

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

47.5
41.4
42.5
44.6

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Magnetic Circuit
Those materials are well suited for making permanent magnets which have ________ retentivity and ________ coercivity.

High, high
High, low
Low, high
Low, low

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Magnetic Circuit
Silicon steel is used in electrical machines because it has

Low hysteresis loss
Low retentivity
High coercivity
Low coercivity

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Magnetic Circuit
The relative permeability of a ferromagnetic material is

Less than one
More than 10
More than one
More than 100 Ωr 1000

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Magnetic Circuit
The unit of retentivity is

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

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