Answer:
(a) You can tell that have the same strength because they have attracted the same amount of paper clips.
(b) Iron is used in electromagnets because steel retained magnetic properties after the power was turned off, but in the iron, the paper clips dropped off right away.
Answer:
Electric currents are normally surrounded by positive nuclei.
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If the frequency of an electromagnetic wave is too high or too low : C. It is no longer an electromagnetic wave
If the frequency is too high or too low, the skin depth pf the electromagnetic wave will not be comparable to the plasma length
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