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Is information (in classical physics) transferred at light speed? Or is it assumed to be instantaneous? What is actually going on in examples such as: 1) An electron in space is surrounded by a capacitor which is connected to a closed circuit. Microsecond by microsecond, what happens? If I have two perfectly rigid boxes, one behind the other, and I push one on the side on a frictionless floor, when will the other box know it's being pushed?

Physics
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i think its instantaneous
Assumed to be so or is?
thats what i think lol

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Other answers:

yes the information is rtansferred at the speed of light
really? So what would happen in the electron problem? The moment an atom of the metal in the switch touches the other side, the electron moves?
first tell which type of current is in the circuit ac or dc
you have a battery (dc) of some EP hooked up to a switch and cap in series. an electron is in the space between the cap plates. You switch it on.
electron will move towards +ve terminal
instantaneous current will start flowing in circuit
assuming it's a perfect switch of course
You need 'stuff' to transfer information. No thing (no 'stuff') can travel faster than light, so no. AT BEST, information (about ANYTHING) travels AT the speed of light, never above.
That was the relativistic answer. Qunatum mechanics muddies the waters considerably (google quantum entanglement).
is information ok
yeah @henpen I heard about that
But rereading the question, as long as you aren't doing electromagnetism you can approximate that it does.
eventually we'll have quantum computers with entangled memories - and finally no lag!
OK. so the current has to reach the capacitor, as I understand it.
An good example is about 4 mins into http://www.youtube.com/watch?v=Yi1H_9JOwkI
But what about the boxes example?
other box will start accelerating as soon as ist box starts motion
Are all your questions to do with the original information question?
As in, do we assume that information can't travel faster than for that question?
@henpen I don't understand what you're saying. But I watched the video, and it seems to me that all forces can transfer their information at the speed of light (at most), since that information is transferred through the force's field particles (if I am not mistaken).
Then only quantum entanglement is the instantaneous one. And I'm not going to pretend to know how that works.
Basically, it's impossible to have a totally rigid body. If you have light year long scissors (even really strong), if you close then quickly they will bend.
okay then the stress/microscopic compressions in the first box will delay the force's movement across it by however much.
But is my assumption about the light speed of forces true?
Yes and Yes.
max speed of light speed*
OK. Cool. that answers a lot, thanks!

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