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Magnetic Circuit

Magnetic Circuit
The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is ___________Vs

50
70
20
500

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Magnetic Circuit
Hard steel is suitable for making permanent magnets because

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

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Magnetic Circuit
The property of a material which opposes the creation of magnetic flux in it is known as

Reluctance
Reluctivity
Permeance
Magneto-motive force

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

Low coercivity
Low hysteresis loss
Low retentivity
High coercivity

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

41.4
44.6
47.5
42.5

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Magnetic Circuit
The unit of reluctance is

Meter/Henry
1/Henry
Henry
Henry/meter

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