Electronic Principles
Which one of the following phrasers best describes flux density?

The concentration of lines of magnetic force
None of these
The rate of change of the number of lines of magnetic force
The force that maintains lines of force
The opposition to a build-up of magnetic fields

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Electronic Principles
One henry of inductance is defined as:

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 number of turns of wire in an inductor multiplied by the amount of current flowing through it
the amount of inductance required to change the frequency of a current by 1 Hz
the amount of counter emf required to reduce a current to 1 A

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

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

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

The impedance is equal to the sum of the resistance and capacitive reactance
The impedance is less than the sum of the resistance and capacitive reactance
None of these
The impedance is greater than either the resistance or capacitive reactance but less than their sum
The impedance is greater than the sum of the resistance and capacitive reactance

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