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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

500
20
70
50

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Magnetic Circuit
The relative permeability of a ferromagnetic material is

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

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Magnetic Circuit
Conductivity is analogous to

Resistivity
Permeability
Retentivity
Inductance

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Magnetic Circuit
In a magnetic material hysteresis loss takes place primarily due to

Rapid reversals of its magnetization
Molecular friction
Flux density lagging behind magnetizing force
It high retentivity

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

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

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Magnetic Circuit
Relative permeability of vacuum is

6
3
1
5

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