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Magnetic Circuit

Magnetic Circuit
The unit of reluctance is

Henry/meter
Meter/Henry
Henry
1/Henry

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Magnetic Circuit
Ferrites have high hysteresis

None of the listed here
Ferrites have high resistance
Ferrites have high resistance
Ferrites have low permeability

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

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

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Magnetic Circuit
Hard steel is suitable for making permanent magnets because

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

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

Resistance
Resistivity
Conductivity
Conductance

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Magnetic Circuit
An air gap is usually inserted in magnetic circuits to

Prevent saturation
None of the listed here
Increase the flux
Increase m.m.f.

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