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Results tagged with electromagnetism
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user 1370
The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.
1
vote
Accepted
Optimum magnet layout for tripping a coil sensor
"Small magnets" will not trip such sensors at all, because those measure the self inductance of the coil. Tripping is done by either increasing inductance from a big ferromagnetic car body, or from l …
- 6,944
1
vote
When is the force null between parallel conducting wires?
Hmmmm...,
the same formula is for the impedance of a Lecher line!
Z = 1/pi sqrt(µ0/eps0) ln(d/r)
Sometimes the formula is given with arcosh(d/2r) instead of ln(d/r),
I assume that is a variant mo …
- 6,944
7
votes
Accepted
The feeling of fuzz on the display surface of a Cathode Ray Tube Television
Your guess is basicly right.
On the backside of the phosphor in a CRT there is a layer of aluminium, which reflects the
light emitted backward to the front, blocks positive ions from damaging the p …
- 6,944
1
vote
Why does a magnetic field go anticlockwise of the direction of current?
Because
somebody decided to have clocks running clockwise,
and all clockmakers since then followed suite.
- 6,944
-2
votes
How much iron ware to make a Faraday cage
Of cours one need a Faraday cage on that boat.
Just a "lightning rod" would be equivalent to
a stroke passing You at the distance to the rod.
The field in the vicinity can kill You!.
On a boat, Yo …
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16
votes
Why is copper diamagnetic?
What is missing here ist the relation to physical/chemical
status of that "copper".
What are You talking about? Copper metal? Copper
atoms as vapour? Copper ions I or II in aqueous
solution?
As a …
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0
votes
Magnetic fields and gravitational waves. How far do they reach?
In this thread one point was not discussed yet,
as far as I read:
That "wire" (which everybody will assume to be straight)
is misleading. A wire with a battery makes a electric
ciruit! "Circuit" ha …
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14
votes
Why do car keys have longer range when held next to your head?
It works with a lot of body parts. It will work with a piece of
wire too. This keys work at about 433 Mhz, a resonant Lamda/4 antenna
is about 18 cm. Obviously the whole key is shorter, the antanna …
- 6,944
2
votes
Accepted
PNMR, Pulsed Nuclear Magnetic Resonance, Experiment
1st all electrons in "normal" matter occur in pairs with opposite spins, thus cancelling each other.
Exeptions like stable radicals or O2, which has a triplet ground state, interact with the nuclear …
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3
votes
Accepted
Is a superconductor perfectly opaque?
At the frequencies (=energy) of visible light, there is no superconductivity.
The band gap due to Cooper pairs is much smaller.
Radiation at higher frequencies (energies) breaks Cooper pairs, creatin …
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-1
votes
What would it take to cause lightning to jump between the Moon and the Earth?
The maximum
Voltage before a current flow will occur from moon to earth
is not that Schwinger limit! It is simply the value
when field strength at the moons surface (smaller radius than earth)
wil …
- 6,944