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

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

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Electronic Principles
Which one of the following statements most accurately reflects the nature of ac power?

The current in an ac circuit flows in two directions at the same time
The current in an ac circuit changes direction periodically
None of these
The current in an ac circuit flows in one direction at a steady level
The current in an ac circuit flows in one direction, but changes value periodically

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