All Questions
Tagged with electromagnetism experimental-physics
29
questions
58
votes
12
answers
15k
views
Home experiments to derive the speed of light?
Are there any experiments I can do to derive the speed of light with only common household tools?
- 6,000
3
votes
2
answers
3k
views
Electromagnetic Momentum
My book says : The fact that electromagnetic radiation of energy carried momentum was known from classical theory and from the experiments of Nichols and Hull in 1903. This relation is also consistent ...
user24082
14
votes
4
answers
4k
views
Kirchhoff's Voltage Law in a General Electromagnetic Field
Recently, Prof. Walter Lewin and YouTuber ElectroBOOM started a discussion about KVL, after Dr. Lewin claimed that KVL did not hold in the presence of an magneto-dynamic field. I would argue that Dr. ...
- 1,043
11
votes
3
answers
6k
views
Experiment which shows that Newton's third law is not true for magnetic forces
I am just reading David Morins "Introduction to Classical Mechanics". He writes about Newtons third law the following:
It holds for forces of the “pushing” and “pulling” type, but it fails
for ...
- 1,702
18
votes
5
answers
2k
views
Can we measure an electromagnetic field?
As far as I can check, the Aharonov-Bohm effect is not -- contrary to what is claimed in the historical paper -- a demonstration that the vector potential $A$ has an intrinsic existence in quantum ...
- 10.6k
5
votes
1
answer
354
views
Experiments looking for monopoles
Background: (skip it if you know it)
In the easiest formulation of classical electromagnetism magnetic monopoles do not exist. In fact, the Maxwell's equation $\nabla \cdot \vec{B}=0$ implies (using ...
- 2,231
4
votes
1
answer
845
views
Thermal emission cathode electron velocity distribution
I can't find any experimental data (or theoretical expression) on what is the velocity (or energy) distribution of thermal emission cathode electrons emmited from the cathode at approximately 2000 K (...
- 143
3
votes
1
answer
1k
views
How to wire a STRONG electromagnet?
I have a 12mm long hard ferrite core that I want to use as an electromagnet. I have wound it with 0.8mm copper as tightly as I can by hand, in a single layer, but the field is not strong enough. I ...
- 1,847
3
votes
1
answer
522
views
Help me understand Pound and Rebka's experiment
I am a second year undergrad physics student and up until now have done some classical mechanics and some electrodynamics. For some reason I have always been really interested in light. A couple of ...
user98025
3
votes
2
answers
1k
views
Oil drop experiment and quantization of charge
How to systematically show that the resulting charges in oil drop experiment are integers multiplied by $e$ in other word how to extract $e$ from the data?
- 4,194
2
votes
1
answer
546
views
How are these "supplementary" or "satellite" Helmholtz coils used?
Three mutually orthogonal pairs of Helmholtz coils can be used to produce a fairly uniform magnetic field of arbitrary direction within a certain volume, and/or to null/cancel an external field (e.g. ...
- 6,273
0
votes
1
answer
3k
views
measuring electromagnetic induction
There is a famous law which says that a potential difference is produced across a conductor when it is exposed to a varying MF. But, how do you measure it to prove? It is quite practical.
...
- 1,013
-1
votes
2
answers
134
views
Is the spin magnetic dipole moment of the free electron not at rest the same as its rest value?
As far as I know all experiments measure the rest value of the spin magnetic dipole moment of a free electron indirectly (i.e. apparently there is yet no method or apparatus to directly measure this ...
- 4,170
11
votes
1
answer
994
views
How the inverse square law in electrodynamics is related to photon mass?
I have read somewhere that one of the tests of the inverse square law is to assume nonzero mass for photon and then, by finding a maximum limit for it , determine a maximum possible error in $\frac{1}...
- 728
8
votes
5
answers
3k
views
How do they find the energy of a photon?
Is the actual energy of a photon ever measured? How is it done?
I read that a photon is usually identified by diffraction, that means its wavelength is measured, is that right? In this way we ...
user104372