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

Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
None of these
The force of attraction between the poles of a permanent and temporary magnetic field
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

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Electronic Principles
The south pole of a magnet is the one:

that would be attracted to the earth's south magnetic pole
None of these
that has its molecules arranged in a random pattern
that would be repelled by the north pole of another magnet
that would be attracted to the earths north magnetic pole

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Electronic Principles
Which one of the following statements is true for the currents in a series RC circuit?

The total current is greater than the sum of the currents for the resistance and capacitance
The total current is equal to the sum of the currents for the resistance and capacitance
The total current is less than the sum of the currents for the resistance and capacitance
None of these
The current always has the same amplitude and phase for every part of the circuit

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