Electronic Principles
A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

3 V
None of these
16 V
7.5 V
8 V

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

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

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