MIT Physics Demo -- Jumping Wire

A long length of wire is suspended horizontally between the poles of a magnetron magnet. When a large current from a 12V storage battery is passed through the wire, the wire jumps out of the magnetic field. When the direction of the current is switched, the wire jumps the opposite direction.
The magnetron magnet in this demonstration was originally used in MIT's groundbreaking research developing radar during and after World War II. Microwave emitting cavity magnetrons need strong magnetic fields, which were often created by powerful permanent magnets like the one used in this demo.
See original video on MIT TechTV - techtv.mit.edu/videos/843

[@wowonice1]

I see a jump rope machine in the near future! :D

[@KamiKagutsuchi]

@ubercute1sf F=I*B*L*sin(x)
F is the force on the wire, I is the amount of amps through the wire, B is the magnetic flux, L is the lenght of the wire inside the magnetic field and x is the angle between the direction of the magnetic field and the direction of the current through the wire. To produce a notable effect, on a rather thin and light wire, you should try to produce anything over 1 newton and you should be able to see it quite nicely.

[@dhakagod]

if u had physics in school you would enjoy it more...we were taught this at school...glad to see it in action !!

[@krishnakovuri7951]

help i don't get this bro

[@cpotts1414]

@xGemingAx That was on purpose to show that current flowing in the opposite direction creates a force in the opposite direction... Right Hand Rule!!!!

[@redyoshi1985]

Wow that's cool I had always heard aout this, but never saw anyone do it before. lol nice!

[@lapulga5]

una demostracion de la ley de ampere

[@ricomajestic]

What gauge cable are you using and what is the best current to use when doing this demo? Is that just a car battery? How strong is the magnetic field of the magnet? Would love to know the specs so I can duplicate the demo.

[@marcossidoruk8033]

Calculate it.

[@JoashOsborne]

This plus pyramid equals Edward Leedskalnin.
I wonder what a iron chain connected in this circuit would do.

[@LuizCarlosRoma]

Oo
Oh man! I can't believe it... Incredible!!!

[@MexterO123]

Science: Force exerted on wire is due the cross product of velocity of charge and the B field

[@eclipse245]

@sumadomi Just finished that unit in gr 12 physics :P

[@PanDanDaMan]

@sumadomi what???

[@yetieric]

Laplace's Forces, so simple ...

[@physicsno1]

F = BIL is the force on the entire conductor. F = qVB is the force on a single electron in the conductor. This is how the electric motor works.

[@1jckinnick]

Something something polarity maybe?

[@AFOVIDIUS]

nice :)

[@407bug]

Can a current jump across a gap if the wire is now cut in the middle and rejoined using a 5mm section of insulator at the point of the magnet
will a magnet help current to jump across a capacitor?

[@cc3814]

@bakkerrich1979 Err its a demo...

[@stabbsx1408]

Up the boys

[@LookMaNoBrains]

What sorcery is this!!!??

[@staphinfection]

Keep it held down...

[@grzegorzbarnik3811]

for pure people

[@Magneticitist]

turn that wire into an actual coil and it might go through the roof lol

[@TCBytom]

nice demonstration but the ending can be depicted in one way: hahahaha

[@abdulrahmanalhasbani1445]

Yes, I don't understand what happened in the end? Can you please explain?

[@raulmg1264]

@@abdulrahmanalhasbani1445 what he did was reverse the direction of the current (the vector forces downward)

[@DemetriosMPapadakes]

oH THANK GOD I'M ON THE LOGICAL PART OF RUclips!!! I AM SCARED TO WASTE TIME BY FALLING VICTIM OF CRACKPOT STUFF EVERYTIME I WATCH A VIDEO LATELY... GEEEZ...
GREAT DEMONSTRATION!

[@HomebrewGuru]

This has nothing to do with microwaves or radar its just the lorentz force

[@madamerotten]

That may be a magnet FROM a magnetron, but it is NOT a magnetron.

[@jani876451]

0:32 Ezt a két tartó oszlopot hogy lerántotta.

[@acropetal]

wow, I understood this experiment without reading anything... Yeah, for me : - )

[@coryg1088]

hooray for big magnets?? i guess?

[@JustWickedSwede]

No, no, no!!! That's not physics! That's poltergeist!

[@apostate7900]

yes!!

[@matthewchristian8685]

Please change permissions so teachers can use this video on platforms such as safetube.

[@honeypooh8523]

NOOOO STOP IT 😭😭😭

[@jani876451]

Ez az indukció ami egy erős mágnes és egy vezeték ami két pólus közt van, 12 Voltos aksival működtetve felrepül a vezeték 0:26, és ellenkezően lehúzza, hogy még a két állvány is eldőlt 0:33.

[@xGemingAx]

0:30 fail xD

[@Batspid3r]

how is this usefull?

[@YukariYakumo0]

hahahae

[@jasonsweet228]

LOL it died.

[@WarzSchoolchild]

See Wikipedia "Lorentz force". A thought experiment, (to baffle those quackademic MIT Professors!;D) A massive copper conductors 10,000 meters long, doubles back at 5,000 meters it is 100 mm x 100mm cross section and suspended every meter like a long pendulum, and each conductor is in a one Tesla flux magnetic gap. We have a 1.25 volt AA battery that can deliver a 10 amp pulse. Now do the physics & maths! A lot of Newtons force for a little AA battery! The Professor will look very stupid!

[@artifactingreality]

woooooooow that's the least amazing experiment I've ever seen.
I mean come on speakers work on the same principle and they're about 100 times more interesting to watch.

[@Hopeless_and_Forlorn]

You are doing it wrong. You are supposed to listen to speakers. Not much to see, actually.

[@boobdoi]

DARK FORCES ARE AT WORK o_0