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 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 north pole of a magnet is the one:

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

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