MIT Physics Demo -- Forces on a Current-Carrying Wire
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- Опубліковано 7 сер 2008
- Two flexible wires are suspended vertically. The wires are conected in series or parallel to a 12V storage battery. When the wires are connected in series and power is applied they will repel each other; when they are connected in parallel they weill attract one another.
This effect is due to the magnetic fields created by the charge flowing through the wires. When the wires are in parallel, the currents in each are going in the same direction and thus attract. In series the cur
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Two flexible wires are suspended vertically. The wires are conected in series or parallel to a 12V storage battery. When the wires are connected in series and power is applied they will repel each other; when they are connected in parallel they weill attract one another.
This effect is due to the magnetic fields created by the charge flowing through the wires. When the wires are in parallel, the currents in each are going in the same direction and thus attract. In series the currents are going in opposite directions and repel.
See original video on MIT TechTV - techtv.mit.edu/videos/813
Series and Parallel aren't very useful descriptions here. The wires attract when the currents are flowing in the same direction. And they repel when the currents flow in opposite directions.
+Paul Nord i guess the video is simply describing the effect between set up and the wires not the electromagnetism principle underlying.......(although its supposed be taught in your way)
Thank u
Yeah, I thought that was a bit strange.
You are right....
@@kevinhu459 its always the small things we mess up
Such a short and accurate video; superb
very good,thanks.
sire the video is quite flabergasting yessss
Too wild my bro
can you explain more detail about circuit connection for this demo. i want to try it.
that is well known magnetic forces, explain to me how I get "unidirectional forces from" cables and STRAIT conductors in a certain "fashion" if I have a current one way the arrangement moves in one direction, when the current is reversed the arrangment moves to a different direction. I think I have finally cracked unidirectional propulsion for good
Which material wite are you using and what is the resistance and length of the wire?
what type of wire suitable to use
Which way is lorentz force if a magnetic field and the direction of current are parallel in the same direction? I couldn't get right hand rule to cooperate.
nice
what is the Ah of the battery ?
Plz explain the connections
what are the threads made of wires??
I need circuit diagram
which currents do you use?
Abi nakog nay nagstorya, waman diay
What does that tell you about gravity which is based upon the Lorentz Force???
Thanks, it will be more good if you put, mount an ampmeter for calculate to "How many power..."Ok, thanks... Was it 100 A?...
I am in the design phase of building this exact demo for my own science classroom. What gauge wire is that you used?
Try car battery jump lead wires as they are probably all you will need to emulate this experiment. Operate switch in short on off pulses of course!
which wire have u used?
strange, if you have two electrons stationary , they repel each other (static force), but if you take these same two electrons and shoot them down a parallel path, they then attract each other (two parallel line currents in same direction).
if two static electrons are placed north and south on the earth, shouldn't the electrons attract each other since the are both travelling parallel due to the direction of the earth's rotation (parallel line currents) ?
+brian menendez i guess by referring to gieger-masten experiment the electrons should be crashing to the gold nuclei not repelling and deflect....if its in ur way of thinking
+Jason Rorschach *alpha-particles
Jason Rorschach in general, static repulsion force for two electrons if stationary, yet attractive force for two electrons if moving in parallel motion.
haven't heard of gieger masten experiment, will look it up thanks
urm its just the experiment when rutherford's apprentice accidentally figure out the atomic structure is acturally hollow with a small dense positive charged nuclei.....or u may name it the alpha scattering experiment
For your hypothetical, the classical answer is that they're both stationary relative to the earth (in the same way that we don't "feel" like the earth is rotating). But that answer just leads to another question: if they're moving parallel through a wire at the same velocity, aren't they stationary relative to each other?
The real answer comes from relativity. Einstein showed that magnetism (the effect that pulls the wires) is just another aspect of electricity (the force that pushes like charges apart), but it can only be understood this way using special relativity, and is not intuitive. Unfortunately I don't really understand this at a deeper level, so I can't answer any follow-up questions. But I hope this at least gives you another path to search.
What apparatus do we need for making this experiment
wires, a power source, and a 3 state switch
How much current do you have going through those cables and what type of cables are you using? What are the best specs for doing this demo?
This does not matter because the magnetic field does not extend to infinity; it has limits where it ends and where its impact fades away. And if we spaced between the two wires for a distance, it will not happen repulsion and attraction between the two wires will pass the current naturally and we will not be able to see this experiment.
@@mohammedhassankorna Wrong. The magnetic field _does_ extend to infinity. In cylindrical coordinates; when you have a steady current I_0 flowing in the z-directions (like the current in the wire does), the moving charges will create a magnetic field that circles around the wire (in the θ-direction). The magnetic field is given as B(s)=I_0*μ0/(2π*s), where μ0 is the vacuum permeability and s is the radial distance from the wire.
Wow human nerves !
how to make such a switch as shown above ?
I can show you if you'd like to leave an e-mail address
It actually needs a double pole double throw switch
that 3 state switch (0,1,2) really threw my physics teacher for a loop when she tried to explain how it worked to the class as until this point we'd only ever discussed switches in a binary manner (on or off)
what is the current of this system?
+Caleb Kittle in this case could be both? because it is just the matter of connecting wires not the current flow. Just like the case when currents flowing down and up has no observable differences obtained in same experiment set up(am i right?)
if we didn't know about the science behind this it would be wizardry
"Any sufficiently advanced technology is indistinguishable from magic"
Yo es que vengo aqui por JJ
there is no 'electric field' in the electrostatic sense, only a movement of electrons (current) through a wire made of an equal number of protons (thus the net static charge in our frame of reference is 0). The effect is purely magnetic. Magnetism however, is simply the effects of relativity making it so the moving electric charges are length contracted, and the 'magnetic field' is simply a name for the relativistic dilation of what would be called an 'electric field' in a electrostatics.
This is the correct answer
So thats the reason why temp rises with increase in current in a conductor, the charge flowing in the same direction feels the force for unification and during this event it produces more and more vibration due to which thermal energy rises, moreover, i think if we accelerate the charge (same) to close to the speed of light, the charge will be, wait what!! Is that the reason why the charge particle don't chase the speed of light, because it will become more and more heavy, it gain inertia and tries to lower the magnitude of charge 😭😭😭😭😭🤣🤣😭😭😭😭😭😭😭😭😭
I never understood why this is explained as Lorentz force.. that is not Lorentz force..as you can clearly see that the two fields are not PERPENDICULAR to each other to produce a third perpendicular force!
Can you please explain
but there is an electric field also..so equal charges always repel each other...current means flow of electrons...so how is it possible?
No one really fully understands the reason. But its been observed and hence now used for all sorts of things by engineers etc. The observation that was first spotted was by people such as Micheal Faraday. What they did was took a wire and let charge flow through it, unexpectedly a magnetic field was seen to be produced around the wire all the while current was flowing through the wire. So when two wires are in close proximity (depending on direction of currents) they will either feel a magnetic repulsion or attraction. So your not alone in not understanding, no one does. It has a name electromagnetism and it is what has been called a fundamental law of nature, because it is not understood by anyone at a fundamental level. Lots of interesting theories but no one really knows the full story. Its one of natures most wonderful mysteries. And this experiment shows its effects in the simplest way possible.
@@TechTins_Projects Wrong, it is understood easily. It is due to relativistic motion of electrons.
@@TechTins_Projects Thanks for the most honest, best explanation yet.
Fucking magnets, how do they work!?
No one really knows. Hence they have described the electromagnetic force as a fundamental force of nature. In others words magnetism (strictly electromagnetism) is a fundamental force we don't fully understand but have measured. Lots of theories but no one knows exactly why it exists. But knowing that it does exist and its strength enables experimenters and engineers to utilize it.
Basically magnetism is produced when ever charge is in motion. Even static magnets have electrons inside them that have what in "quantum theory" is described as spin and such spin is charge in motion. But "quantum theory" is just a theory, no one knows exactly what is happening at that level. The current idea is that magnetic force is really a relativistic effect and are essentially just side ways produced electric fields when charges are in motion.
good idea
I don't wanna hear from no scientist
Since I have never believed that mass attracts mass lol I am serious I wonder if electro magnetic effects could be the root cause of that for which gravity is held responsible.
If the Moon can move water on the face of the Earth then I am a moonbeam.
I miss vectors.
aww that's okay, vectors are still around. there no need to miss them, b
@TheMACcar Gravy IS magnetism. You don't know what you're talking about.
Lol
Bro goes to MIT but doesn't know how to set up his mic so that it doesn't pick up only his air conditioning.
مين جاي من عند مستر حسن ماهر
Calling both motions "Pull" isn't helpful. Which direction is "forward" and which "backward"? It isn't clear from the perspective of the viewer.
Better to call away from the viewer "Push" and toward the viewer "Pull."