Electronic Principles
What form of energy is used for creating static electricity?

Solar energy
Chemical energy
None of these
Mechanical energy
Light energy

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Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

Resistances provide the only opposition to current flow
None of these
The ac voltage lags the current by 90 degree
Inductive reactance provides the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow

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

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

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