Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

An electron has a negative charge and a proton has a positive charge
None of these
An electron has a positive charge and a proton has no charge
An electron has a negative charge and a proton has no charge
An electron has a positive charge and a proton has a negative charge

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

The amount of magnetic flux that is not confined to the core material of an electromagnet
The circular magnetic field that surrounds a conductor carrying a current
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
None of these

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