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

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

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

The voltage always has the same amplitude and phase for every part of the circuit
The total voltage lags the total current by less than 90
The total voltage is equal to the sum of the voltages across the resistance and inductance
None of these
The total voltages is less than the sum of the voltages across the resistance and inductance

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Electronic Principles
When a series RLC circuit is operating at its resonant frequency:

inductive reactance is equal to the capacitive reactance
the difference between inductive and capacitive reactance is equal to the resistance
inductive reactance is greater than the capacitive reactance
None of these
capacitive reactance is greater than the inductive reactance

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Electronic Principles
Voltage is

Trie force that causes electrons to flow
The smallest electrically charged particle
The number of free electrons in an atom
None of these
The flow of charged particles through a material

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