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Magnetic Circuit

Magnetic Circuit
The unit of reluctance is

Henry/meter
Henry
Meter/Henry
1/Henry

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Magnetic Circuit
The rate of rise of current through an inductive coil is maximum

At 63.2% of its maximum steady value
After one time constant
Near the final maximum value of current
At the start of the current flow

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Magnetic Circuit
Hysteresis loss least depends on

Ambient temperature
Volume of material
Frequency
Steinmetz’s coefficient of material

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Magnetic Circuit
A material for good magnetic memory should have

High permeability
Low hysteresis loss
High retentivity
Low retentivity

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

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

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Magnetic Circuit
Those magnetic materials are best suited for making armature and transformer cores which have ________permeability and _________hysteresis loss.

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

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