Timeline for In which situation does the electric field vary sinusoidally with position?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Oct 18, 2019 at 16:34 | comment | added | user240696 | Let us continue this discussion in chat. | |
| Oct 18, 2019 at 14:34 | comment | added | user240696 | Okay sir I will try to forget everything and then read your answer and comments. I will let you know if even after that I get some problem, am I allowed? | |
| Oct 18, 2019 at 12:18 | comment | added | garyp | You are making many unfounded assumptions, and drawing conclusions from them. #1: " every electric field should be inversely squared to distance" Not true! #2 "we can assume that my charge is static" Not true! #3 " the source charge is at the intersection of those red, blue and c axes" Not true! Sit back. Reread comments. Think. Don't add your own spin on what you see, and what people are trying to tell you. | |
| Oct 18, 2019 at 6:59 | comment | added | user240696 | Sir, my question is why the electric field is going in a wavy manner? As far as my knowledge every electric field should be inversely squared to distance and as I say that my image is a snapshot at a time t, therefore we can assume that my charge is static and hence field should vary as inverse square of distance. What's causing the field to increase and then decrease and then increase again and so on.... ? | |
| Oct 17, 2019 at 18:40 | comment | added | garyp | The word "amplitude" can mean maximum field strength in a cycle or instantaneous field strength. Let the maximum field strength in a cycle be $A$. Then the instantaneous amplitude varies between $-A$ and $A$ in the course of one cycle. My small volume is large enough to contain many wavelengths, but small enough that the maximum field strength in a cycle does not change appreciably. | |
| Oct 17, 2019 at 17:49 | comment | added | user240696 | Wavelength means distance between two crests, so what is the crest here? According to me the crest is the max amplitude of $E$ and that’s my problem why $E$ is fluctuating at all when you have said that $E$ wouldn’t change in small volume? | |
| Oct 17, 2019 at 17:40 | comment | added | garyp | The EM wave, like any other wave, has a wavelength. That's what's being displayed. | |
| Oct 17, 2019 at 17:33 | comment | added | user240696 | Yes. But why then there is wavy electric field shown in the picture of EM wave? What does that really convey? By the way thank you for your very clear explanations. | |
| Oct 17, 2019 at 17:30 | comment | added | garyp | Your interpretation is not correct. The source cannot be at that intersection. The source must be a compact source very far away. A star would be a very good example. The amplitude here on earth does not change with distance very much at a distance of one million light years from the source. | |
| Oct 17, 2019 at 17:23 | comment | added | user240696 | Your second paragraph is clear to me but your first paragraph, when you said for which the amplitude doesn’t vary with time is not understandable by me @AaronStevens is trying to explain me that amplitude thing but I’m not able to understand it. I’m viewing that diagram as if the source charge is at the intersection of those red, blue and c axes and as I move along c-axis I’m moving farther and hence field should diminish even if the charge is vibrating sinusoidally. | |
| Oct 17, 2019 at 16:35 | history | answered | garyp | CC BY-SA 4.0 |