All Questions
Tagged with wire electromagnetism
22
questions
14
votes
1
answer
2k
views
Why do these secondary transmission wires coil around the primaries?
All three primary transmission wires in the picture below have smaller wires coiled around them. These smaller wires (secondaries?) connect to a transformer and onto a nearby house. The coils follow ...
- 143
0
votes
0
answers
44
views
Magnetic Force Between 3 parallel conductors
I have a problem with 3 parallel conductors carrying currents, as shown in the picture. I need to determine the force per meter length acting on the bottom-right conductor (carrying current I2).
I ...
- 11
2
votes
0
answers
101
views
Analytical solution for the characteristic impedance along vertical wire over PEC ground plane (at given point h)?
For the purpose of TL transformer simulation I need a solution for the characteristic impedance of vertical wire, with radius a, at the infinitesimally short segment - not point, at the height h above ...
- 55
0
votes
2
answers
105
views
Where to find huge solenoid inductors (~25 H) or cheap magnet wire? [closed]
I am on an energy harvesting project, and it would require a 25 H solenoid inductor (width 0.3 mm max).
The only issue is that I am completly unable to find any inductors of that size on the internet. ...
- 28
1
vote
0
answers
55
views
What are the components I would need for an electromagnet with the given specifications?
I need to make an electromagnet that exerts at least 5 times its own weight on a ferromagnetic material kept 0.03 m away.
I know that:
F = [(number of turns × current)2 × magnetic constant(4 × pi × 10-...
1
vote
1
answer
170
views
Can steel nails be substituted for the silicon steel laminate in a motor/generator/alternator?
This is as diagram of a generator/alternator in which steel nails are used in place of silicon steel laminates:
- 137
1
vote
2
answers
159
views
Why/How alternating currents through coaxial cable do not interfere with each other?
I know that cable TV use coaxial cable with alternating current frequencies varying from 5 MHz to 750 MHz.
Why/How a alternating current of, for example, 5 MHz , 10 MHz, 20 MHz, 100 MHz, 300 MHz, 500 ...
2
votes
3
answers
546
views
Copper wire current ratings [duplicate]
I have seen a wide variety of different estimates for the maximum current rating for copper wire. For example, for 24-gauge copper wire, the Wikipedia article about "American wire gauge" claims that ...
- 121
1
vote
1
answer
773
views
Why does the self-inductance of a straight wire decrease when its radius increase?
I made some research on the self-inductance of a straight wire, and many sources cited “Inductance Calculations” of F.W. Grover. So I read a bit of that book but I couldn't find the answer to my ...
- 733
3
votes
2
answers
594
views
What is the mechanism that causes two conductors to "stick together" when a current is passed?
If the positive and negative terminals of certain DC supplies are brought together under certain conditions, the wires will "stick together" with a slight force, feeling almost like they are ...
- 5,182
-1
votes
3
answers
756
views
Why does having magnetic material in the middle of a stator help generate a current?
It seems unintuitive to me why putting a stationary hunk or iron or neodynium in the middle of a copper coil generator would increase its conductivity, because the metal could act as its own ...
- 121
4
votes
6
answers
10k
views
Using Neodymium Magnets as wire connectors? [duplicate]
A new project I'm working has to be highly modular. All the electronics will be hidden in a case, so I was wondering if there's any way to use magnets and pass current through them for the project?
...
user33335
2
votes
2
answers
814
views
Why does the inner conductor of a coax contribute to magnetic field outside the hollow conductor?
While studying the coaxial cable, i noticed that the magnetic field of the inner conductor can pass through the hollow conductor (can be calculated in the region 3). However, the boundary condition of ...
6
votes
4
answers
1k
views
Does a twisted pair cable radiate more EM radiation than non-twisted pair?
I am looking at many electronic forums and people always come up with different answers, so I would like to settle this question once and for all.
Does a twisted pair cable radiate more EM radiation ...
- 91
-1
votes
2
answers
1k
views
Cable type and decreasing EMI/RFI
I am interested which cable/wire type is better to protect against electromagnetic and radio interference/leakage of signal.
Is a twisted pair wire better than an untwisted, to protect against EMI/...
- 1