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

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

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Magnetism and Electromagnetism
When an iron piece is placed in a magnetic field

the magnetic lines of force will bend away from their usual paths in order to go away from the piece
the magnetic field will not be affected
the iron piece will break
the magnetic lines of force will bend away from their usual paths in order to pass through the piece

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