MIT Physics Demo -- Jumping Wire

[Batspid3r]

how is this usefull?

[madamerotten]

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

[ROBLOXcrazyman32]

It's like the wire is having an orgasm.

[HomebrewGuru]

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

[bakkerrich1979]

Is this really what they do at MIT? Fuck me get a life. This is something a five year old can do with a few magnets and a strand of wire.

[cc3814]

@bakkerrich1979 Err its a demo...

[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!

[JustWickedSwede]

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

[MrRobotoToo]

Fucking magnets, how do they work?

[ipopjizzy]

e=mc fck my life lol

[webmastertool]

E = MC^3

[KomodoDragoon]

@webmastertool wtf?

[Magneticitist]

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

[tonytvtech]

so that explained those bumps in the night

[frosty1433]

subscribed

[ubercute1sf]

my teacher showed example of this in class, when I attempted to do this it did not work. How strong should the magnet be for a thin wire and strong electric source? In teslas?

[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.

[boobdoi]

DARK FORCES ARE AT WORK o_0

[coryg1088]

hooray for big magnets?? i guess?

[yetieric]

Laplace's Forces, so simple ...

[xGemingAx]

0:30 fail xD

[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!!!!

[super6plx]

for anyone interested, this is because a current running in one direction with a magnetic field CROSSING through it, it experiences a force. in this case, up and down depending on which way the current goes through the wire

[staphinfection]

Keep it held down...

[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.

[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.

[sumadomi]

F = qv x B

[modhurin08]

@sumadomi In this case, it's more like:

F= integral I X B dL

There is no discrete charge.

[sumadomi]

B & v => vector fields

[garyremindable101]

@sumadomi what???

[sumadomi]

@garyremindable101

if B & v are continuous vector fields you need the infinite sum of all the vectors (integral) to obtain the resultant force F=qv x B is the general case

you can see this problem like a discrete charge (all charges are quantized) but irl is more easy solve it with the integral of the current I (we have meters for that)

[beatnik8983]

@sumadomi genius

[eclipse245]

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

[luccaueda]

@sumadomi

Actually that equation is been used for particles in action of some uniform magnetic field

The right equation, we use in events like in this video is F(Newtons) = B(Tesla) * i(Ampers) * L(meters) * sin(x)

[TubeTest42]

@sumadomi Or F=BIL ... (Sin theta) but its right angles so Fleming's left hand rule!! :)

[constfadeev]

@sumadomi this F=I*B*L*cos(a)

[AFOVIDIUS]

nice :)

[lapulga5]

una demostracion de la ley de ampere

[msdaif]

Principle of DC Motor

[redyoshi1985]

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

[Thorsupremecommander]

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

[EvilRabbiMAn]

that magnet they have is used for finding cracks in engine blocks

[GTR0134]

how does this work?

[EvilRabbiMAn]

you put it on the cast iron block where you think the crack is and then you spread iron powder between the N and S poles and the iron powder shows you where the crack is.

[GTR0134]

Okay, I get it. But you can use also some special spray for finding cracks.

[modmadmike2]

hahahae

[frizspin175]

lol

[LCRomaJR]

Oo

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

[dhakagod]

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

[MyNameIsTylerY]

that's awesome

[titan768]

hehehehehehehehehe