Electronic Principles
A typical light switch in your home is a:

None of these
toggle switch
rotary switch
knife switch
momentary push button switch

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

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

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