Lenz's Law

[mayurbannai3102]

didn get any of the shit

[TheSaltysack]

hey do you thick that aposing magnetic field is antigravity like using aluminum and a 240 tune coil by tunning it to the right frequency it will lighten in weight this is said by senior boyd bushman he worked for lockheed martin its on youtube just type boyd bushman

[rocknrollkunt]

Am I getting this right?

that blue shit in the middle is a conductor and the green surrounding lines is the primary magnetic field

the yellow line circulating the magnet is the eddy current

and then the yellow rings on the side is the secondary magnetic field, opposing the primary magnetic field

[rocknrollkunt]

@rocknrollkunt circulating the conductor i mean

[silverraider47]

@rocknrollkunt the green lines (or blue) are magnetic flux/field, the yellow circles are the magnetic field that is induced by the current.

As the magnetic flux changes (the magnetic field lines number moving from low to high) , the ring (or conductor) would be induced with current, and hence produce a magnetic field (yellow lines)

and no, the brown ring is the conductor. the blue part is to just illustrate how much flux lines are passing through the ring, inducing current in the ring.

[mrg3]

@rocknrollkunt The green lines are the magnetic field lines, the blue area is the area bounded by the red conducting wire loop. Lenz's Law is stated in terms of changing magnetic flux, which is how much magnetic field (green) goes through the area (blue).

When that flux (blue graph) changes with time, it drives a current with an EMF (yellow graph) which drives a current in the loop (yellow loop). The yellow loop induces a secondary magnetic field (yellowish green lines)

[magisterkarlsson]

This animation is great. Thank you!

[kelvinlo125]

it's really complicated

[RylyC]

Also, what software did you use to make this?

[mrg3]

@RylyC I use POVRay to create the frames of the animation, and virtualdub to sew them up into an avi file (with compression)

[RylyC]

Perfect animation. Thank you very much.

[mmykle]

Helped a bunch! Although I wish you changed the direction of the B-field and then ran the simulation again. Because I don't know what would happen in that instance.

[MrEnceladus18]

this REALLY didnt help me at all.

[coldarc]

protons electrons and neutrons are made off neutrinos. also called virtual particles.

when you induce an electric current you change virtual particles from a unobservable particle state to real observable EM energy. a change in electric resistance is a asymmetrical change in the virtual photon flux that deliver energy to all subatomic partilces in an un-observable form. you can say there is a neutrino universe that formed all elements in ours.

[coldarc]

its crap. when you drop a megnet trough a copper pipe the magnet try to align a mangetic field with it in the copper but since the change in electric resistance reuslt in the creation of electron source dipole it can then produce another change in electric resistance that induces a magnetic source dipole in opposite direction of the magnetic field that induced it. its the electric source dipole that induce lenz law magnetic repulsion between the magnet and the copper pipe i think.

[mrg3]

@coldarc This animation is ONLY on the induced current, it doesn't try to show the interaction between the induced current (and resulting dipole) and the field which crated it. I don't know what you are trying to say about "change in electric resistance".

[phelepone]

@coldarc to sum up just read his last two words

[kungman190]

WTF IS THIS?

[gatoradeee]

remember emf changes only if the magnetic flux or the time interval changes. That's why nothing happens when the flux is constant.

[d0ugr0ck]

Thank you :) That cleared things up xD

[DivineNucleus]

OEAR ©ollin logic design -Ai -element ship, calculate how Collin wins in twenty moves, use this -- sound as scroll, & design universal plan.

[Kuwaiti1990]

only high people can understand this video

[haloapa]

No idea what this is trying to say. I am doing my tutorials now!! no idea how to find the direction of induced current.

[Ortmoon]

Wow, I can't even understand this.. ARGH !!

[joshadx19]

WOAH THANKS! DIDN'T GET ANY. haha.

[MrJosephkb]

cant understand ...god i hate my teacher worst in the univers

[mrg3]

Lenz's Law: the flux (net # of field lines) through the loop TRY to stay constant, & the induced current in the loop creates a new field/flux to oppose the change that created it. (Direction of the lines is also important.)

When the external lines get closer together, the field is getting stronger. The induced current in the coil crates a filed through the loop in the opposite direction of the CHANGE. Weakening field-> opposite current.

2nd part = changing geometry

[leonheart208]

When you expose the loop to an field, a current is induced on the loop, to generate an opposite field, so everything is "stable"

[xjkgx]

a drop in the electromotive force corresponds to the rate of change of magnetic flux in the opposite direction when the electromotive force remains constant, no magnetic force is produced...faradays law of induction :)

[PsionNinja]

The 2 moving points on the graph seem to at the same level at 0:11 and 0:14. Is this of any signifigance?

[xjkgx]

yes indeed, that is because the electromotive force remains constant, then no magnetic field is induced, notice that as soon as the electromotive force increases a changing magnetic field occurs in the opposite direction and vice versa when the disk is oriented parallel to the x-axis and a sharp electromotive force applied induces a magnetic field as soon as the emf drops then a field is created in an opposite direction, causing it to rotate, polarity shifts and this is known as AC current :)

[usersrm]

Is it lenz's law or faradey's law

[mrg3]

It is Faraday's Law, which tells us about how the rate of change of flux is related the induced EMF/current. It is also Lenz's law which specifies the direction of the induced EMF/current. I've identified this as Lenz's law in the title because that is what I am emphasizing when I use this animation in class.

[specialks1953]

Looks cool, I have no idea what this is about but now it is as clear to me a mud.

Thanks for trying anyway.

Harry Callahan said "A man's got to know his limitations." Thanks for the interesting post. I'm gonna go away now.

[RICExCRISPY]

THANKS. clarified things

[choca7]

But why did the induced current suddenly disappear along the half way as the magnetic

flux was increasing...? That's the part I

do not get

[mrg3]

I don't see that. The current only flows when the flux is changing. It stops in the first segment when the flux is maxed out, and no longer changing. The current starts up in the reverse direction when the flux begins to decrease.

The top graph is the flux, and the second represents the EMF (which is proportional to the current). Since the EMF is the derivative (or slope) of the flux, when the top graph is level, the second graph (and current) is zero.

Hope this clears things up.

[jamehdi]

U have to see how many vektors of B(magnetic field) in the small constant area change or path thru , flux= magnetic field times Area , as B is constant and area too . the rotations about an axis changes the flux , soo an induced magnetic field exists in a way to let the magnetic flux constant , this means the induced magnetic filed tends to decrease or increase the magnetic field ! , since we have a closed circuit , an induced current will exist and EMF (electromotiv force ) exists too .

[naqvi000]

@choca7

thats because at that point the direction of tangentanial velocity and the direction of megnatic field are parrelal on one side and anti parralel on the other

[Arkthurius]

The first part is changing magnetic field creating a voltage, this is the Faraday's induction law. The second part, the ring rotating, is the principle that a wire moving thru a magnetic field will get an induced voltage, but this is usually not mentioned as faraday's law. Only the first part. Anyway both types of induction have their bases of the relative movement of a magnetic field and electric charge.

[Arkthurius]

Great clip. It shows that it is the relative movement instead of the variant magnetic field strength (which is actually another way to see relative motion) what causes an EMF.

[blower05]

What program did you use?

[TLHS]

I'm curious. was the magnet drew all the way through the coil? or was it pushed in and pulled back out the same side of the coil? I worked out how to drive several magnetic flux fields through 1 or multiple induction coils cyclic. It's quite simple.

[mrg3]

I'm not sure what you mean. The straight lines represent the external field (you might consider them as coming from a very strong electromagnet of variable strength). The lines getting closer together/farther apart is a visualization of that external field getting stronger/weaker.

The curved lines represent the field created by the induced current in the coil.

[mrg3]

The top graph is the magnetic flux through the loop, which is essentially the number of field lines which go through the area of the loop.

The second graph is the induced voltage, which depends upon how fast the flux changes. Two ways the flux can change is changing field strength (represented by more or less lines in a given region of space) and changing orientation of the loop relative to the field lines (thus the rotation of the loop affects the flux).

[7olusegun]

Could someone please explain this diagram with the side graphs?