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

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

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Magnetism and Electromagnetism
Out of the following statements, concerning an electric field, which statement is not true?

Unit field intensity in the exertion of a force of one newton on a charge of one coulomb
An electric field is defined as a point in space at which an electric charge would experience a force
The electric intensity is a vector quantity
The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

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