Magnetism and Electromagnetism
Materials subjected to rapid reversal of magnetism should have

High co-ercivity and low density
High permeability and low hysteresis loss
Large area of B-H loop
High co-ercivity and high retentivity

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Magnetism and Electromagnetism
The magnetic reluctance of a material

Any of the listed here
Decreases with increasing cross sectional area of material
Increases with increasing cross-sec-tional area of material
Does not vary with increasing cross-sectional area of material

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Magnetism and Electromagnetism
The magnetomotive force is

The sum of all currents embraced by one line of magnetic field
The passage of magnetic field through an exciting coil
The voltage across the two ends of exciting coil
The flow of an electric current

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