Timeline for Why are there differences in antennas that depend on electrical component and magnetic component of a radio wave?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| Oct 12, 2021 at 1:00 | comment | added | PersonWithName | So what the small loop is really doing when used as a probe is just measuring "inductive fields". These are fields that consist of changing H and circulating E and are caused by time-varying currents. If these fields are stronger then inductive coupling will tend to be stronger. People often consider induction to be a magnetic effect when it is really an electromagnetic effect. The terminology is pervasive. That being said, it is often helpful to think only in terms of the magnetic field. | |
| Oct 12, 2021 at 0:59 | comment | added | PersonWithName | I think the important thing to emphasize in this case is that the electrically small loop does not "only respond" to the magnetic field. In fact it will be the electric force that is actually responsible for the EMF (and the idea that this electric field is "caused" by the magnetic field is dubious). It's really that the received signal can be calculated from the magnetic flux (the surface integral of the magnetic field). But it can just as easily be calculated from the line integral of the electric field. | |
| May 31, 2019 at 10:44 | comment | added | Richard Fry | The electric field of an e-m wave is produced by the magnetic field, and vice-versa. Neither field can exist without the other also being present. | |
| May 30, 2019 at 12:58 | history | edited | Richard Fry | CC BY-SA 4.0 |
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| Jan 24, 2019 at 19:24 | comment | added | tomnexus | I'm not downvoting and the book isn't wrong. But it's the same thing as the wires responding to the electric field. The voltage is proportional to the electric field. And the (far) magnetic field is there because of the changing electric field. etc. | |
| Jan 24, 2019 at 16:49 | history | answered | Richard Fry | CC BY-SA 4.0 |