Electronic Principles
Which one of the following phrases most accurately describes a purely capacitive circuit?

None of these
Combinations of resistance and capacitive reactance provide any opposition to current flow
Resistances provide the only opposition to current flow
The ac voltage leads the current by 90 degree
Capacitive reactance provides the only opposition to current flow

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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
The force of attraction between the poles of a permanent and temporary magnetic field
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

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Electronic Principles
Which one of the following principles best describes the basic operation of an electromagnet?

Current flowing through a conductor generates a magnetic field
Like magnetic poles attract, while unlike poles repel
None of these
Like magnetic poles repel, while unlike poles attract
Current is induced in a conductor that is moving through a magnetic field

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Electronic Principles
Which one of the following statements is true for current flowing in a parallel circuit?

None of these
The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
The same current always flows through every part of a parallel circuit
The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
The total current in a parallel circuit is always less than the smallest amount of current

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