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Magnetic Circuit

Magnetic Circuit
Relative permeability of vacuum is

3
6
1
5

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Magnetic Circuit
Conductivity is analogous to

Permeability
Retentivity
Resistivity
Inductance

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Magnetic Circuit
Hard steel is suitable for making permanent magnets because

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

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Magnetic Circuit
When both the inductance and resistance of a coil are doubled the value of

Time constant is halved
Initial rate of rise of current is doubled
Time constant remains unchanged
Final steady current is doubled

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Magnetic Circuit
Permeability in a magnetic circuit corresponds to_________ in an electric circuit.

Conductivity
Resistance
Resistivity
Conductance

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

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

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