Electronic Principles
One henry of inductance is defined as:

the amount of inductance required to change the frequency of a current by 1 Hz
None of these
the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
the amount of counter emf required to reduce a current to 1 A
the number of turns of wire in an inductor multiplied by the amount of current flowing through it

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

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

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

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