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

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

The circular magnetic field that surrounds a conductor carrying a current
None of these
The amount of magnetic flux that is not confined to the core material of an electromagnet
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The force of attraction between the poles of a permanent and temporary magnetic field

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