Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

None of these
An electron has a positive charge and a proton has a negative charge
An electron has a negative charge and a proton has no charge
An electron has a negative charge and a proton has a positive charge
An electron has a positive charge and a proton has no charge

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

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