Electronic Principles
Which one of the following kinds of materials has the highest permeability?

A ferromagnetic material
None of these
A paramagnetic material
A diamagnetic material
All of these

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Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage remains at one polarity but changes value periodically
The voltage remains at one polarity and at a steady level
The voltage causes current to flow in two directions at the same time
The voltage reverses polarity periodically
None of these

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