All Questions
8 questions
0
votes
2
answers
112
views
Couldn't understand the reasoning on the propagation of the electromagnetic wave in the vacuum?
Since the solution of the wave function in vaccum gives two progressive plane waves $f(x-ct)+g(x+ct)$ depending on $x$ the direction of propagation, in the other side we have the $\operatorname{div}(...
0
votes
0
answers
41
views
Does altitude play a role in the strength of electric fields?
After many controlled trials, I can conclude that the same device - e.g. a monitor - will emit far higher electric fields upstairs than downstairs, from the same distance, and in environments that ...
1
vote
2
answers
376
views
$\pm$ sign in electromagnetic wave ratio of $E$ and $B$ for regressive/progressive case
I found on textbook that the magnitude of electric field $E$ and magnetic field $B$ in a plane electromagnetic wave are always related by the fact that
$$\frac{E}{B}=\pm v$$
Where $v$ is the ...
- 2,637
0
votes
1
answer
98
views
What happens to wave energy if i excite wave guide with frequency below than cutoff?
Suppose I excite waveguide with frequency less than cutoff frequency. According to solutions of Maxwell equation energy of the wave must decay exponentially. Where does the energy disappear or lost in ...
- 1
1
vote
4
answers
12k
views
Why do like charges repel and opposite charges attract? [duplicate]
Why do like charges repel and opposite charges attract?
0
votes
2
answers
938
views
Does a rotating DC motor near a TV affects the signals coming in the TV?
In my TV cable the signals were quite noisy so i cut the wire and hanged both the wire parallel to each other. Then the signals became very clear and everything was going alright. Once I was ...
- 53
19
votes
5
answers
18k
views
Is there any example where electric and magnetic fields are not perpendicular?
Perpendicular electric and magnetic field creates light or other electromagnetic waves. Is it a necessary property to have a perpendicular fields? If not what would happen when the fields are not ...
- 1,985
14
votes
7
answers
12k
views
Why is electricity not transmitted wirelessly?
Why is electricity not transmitted wirelessly such that we don't need to span cables on the earth's surface? As in: electricity is transmitted wirelessly from the power plant to the household.
- 2,729