Electronic Principles
Which one of the following phrasers best describes flux density?

None of these
The force that maintains lines of force
The rate of change of the number of lines of magnetic force
The opposition to a build-up of magnetic fields
The concentration of lines of magnetic force

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Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
None of these
Hysteresis is most apparent when the core material is saturated
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet

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