Electronic Principles
One henry of inductance is defined as:

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

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Electronic Principles
What is a free electron?

None of these
An electron that costs nothing
An electron that has twice the amount of charge of a normal electron
An electron that has no electrical charge
An electron that has been freed from its parent atom

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

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