All Questions
9
questions
12
votes
1
answer
246
views
Weight of magnet depends on its N-S orientation?
I weighed a Neodymium disc magnet and found that it weighs about $1$ mg more when the north pole is upwards than when the south pole is upwards.
Can this be explained by "conventional" ...
- 5,925
0
votes
4
answers
147
views
I need help devising a classroom experiment to detect the magnetic field generated by a current in a wire
I want to devise a simple procedure that can be followed by students to discover that a current in a wire produces a magnetic field near that wire.
I am of course restricted to very simple materials, ...
- 147
5
votes
3
answers
859
views
Common microwave absorbing substances
I'm looking to demonstrate to class of students how microwave absorption works, but I need something relatively common which I can easily make into a board. Does anyone have any suggestions for ...
- 972
1
vote
1
answer
641
views
Can I measure light intensity using only .jpg pictures?
I have two pictures. On first one can see a lamp shining straight into my smartphone's objective and on the second picture one can see the same lamp but covered with a piece of paper.
Can I use those ...
- 3,034
2
votes
1
answer
383
views
Why are only some portions of the EM spectrum able to pass through a metal dog bowl?
In this photo you can see part of the bowl, which I turned upside down and placed on top of various electromagnetic sources to determine whether the waves could pass through it. The graph in the ...
- 4,711
4
votes
2
answers
1k
views
Why my simple electromagnetic experiment does not work?
I make a setup (see attached picture).
ONE coil (1" diameter x ~120 turns), which is separated with a gap, is mount on two sides. Each side has an iron rod (1" diameter x 6" long) to increase the ...
- 621
6
votes
1
answer
18k
views
How does the speed of a DC motor depend on the size of the coil?
I have to build a simple electric motor by attaching a magnet to a battery, extending the terminals of the battery (with stiff wires so they could act as supports), and placing a coil of wire on top ...
- 2,889
18
votes
5
answers
4k
views
Home experiments using wireless LAN or mobile phones about electromagnetism?
Are there any nice experiments using wireless LAN access points or routers or mobile phones to demonstrate physical features of electromagnetic fields, especially em-waves?
More precisely I am ...
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