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5 votes

If electromagnetic waves are indeed created by a changing electric and magnetic field, then why don't we see magnet based antennas?

We are bombarded by EM radiation from many sources. Here, from https://swling.com/blog/2016/06/steve-points-out-the-itu-r-recommendations-on-radio-noise/, is radio noise from various sources. At ...
John Doty's user avatar
  • 4,632
2 votes

If electromagnetic waves are indeed created by a changing electric and magnetic field, then why don't we see magnet based antennas?

You could indeed make an EM radiator by moving a magnet -- spinning it cross-axis, say. The problem is, for the speed to be fast enough to have reasonable (or even detectable?) emissions, no known ...
Tim Williams's user avatar
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2 votes

E-Core Electromagnet Vs. Bar Electromagnet: Force and Range

Take a look at your flux path on your magnet when the object is not near. Your path is shorter than the distance away from the object you want to attract. There are only two air gaps in your path, ...
John Birckhead's user avatar
1 vote

FE Practice Question: How to use the given formula?

I'm not sure how to use it as it involves solving the square root of a complex number. Convert the complex number to a magnitude and phase. Then take the square root of the magnitude and halve the ...
Andy aka's user avatar
  • 462k

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