eddy currents and electromagnetic braking explained

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In this video I use Lenz Law to explain how eddy currents form when a piece of metal passes through a magnetic field. This is often also referred to as electromagnetic braking.
SEE THE LESSON ON ELECTROMAGNETIC BRAKING - www.physicshigh.com/lenz-law....
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Опубликовано:

13 мар 2018

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Комментарии : 79

@ericzhu1751 4 года назад

Beautiful explanation definitely cleared up any misconceptions I had. That top view diagram is something that helped a lot with understanding why it slows down.

@lpfilter1678 4 года назад

Perfect and very clear explanation, it is always helpful to take a look on internet when studying a hard to visualize concept

@S-MKim Месяц назад

I like your induced magnets on the plate. Their orientations are perpendicluar to the direction of motion but still they do the job. clever.

@mg-nx7sr 4 года назад

honestly BRILLIANT absolute dominance on the side of clear demonstration as soon questions popped inside my head they where answered thanks a ton sir and have a GREAT life :)

@JH-it2yr 2 года назад

Thank you so much! I just had my class yesterday and my professor didn’t really make it clear. Now I get it!

@kaka63211 3 года назад

brilliant explanation, this is what most teachers lack clarity in explaining...

@PhysicsHigh 3 года назад

Thanks

@timytli2012 5 лет назад

Thank you so much Paul. A couple of resources I'm using with my current y12 didn't put this as clearly and I was beginning to doubt my own understanding!! As always, so useful for the course.

@krsnaprema 2 года назад

GITA

@affafakbar1321 2 года назад

Beautifully explained

@antonyabiya 6 лет назад

Awesome... understood clearly..thanks

@goodlife3360 5 лет назад

Thanq sir for clearing my doubts It is really helpful . Thank you again

@hectorgarcia-pacheco4943 3 года назад

Fantastic explanation!

@sumitabc1 4 года назад

Very nice explanation

@alfalife2003 3 года назад

THANKS ITS WELL EXPLAINED

@solairamatchandiraneprabag1987 4 года назад

Wonderful demo sir

@3marElsayed 5 лет назад

thank u so much very clear!!

@SarrouTube 2 года назад

Excelllent explanation

@karthikmahadevan9913 2 года назад

Great explanation

@user-jl1lq4ih4n 6 лет назад

wow awesome video Thank you so much !

@nilesh9171 4 года назад

sir nice explanation thankyou

@leocarlton4364 3 года назад

My phsyics teacher is an absolute clown. Can't explain anything. You sir, are fantastic. The conceptual framework is brilliant.

@solidus8098 6 лет назад

Very well explained sir! Thank you!

@PhysicsHigh 6 лет назад

You’re welcome.

@cwt9404 2 года назад

The video is great! but what are direction of forces act on metal strip causing it to brake? the motion of the metal strip is left and right, but the repulsive and attractive force due to poles of magnet & metal strip is into and out of paper. So, what forces are acting in parallel to the motion of metal strip tp cause braking ? thanks

@redcurtain6851 5 лет назад

Great job

@shanthala1345 4 года назад

Thanks a ton!💯❤️

@mrregisx6261 5 лет назад

Articulated nicely!

@borderbonda3145 Год назад

Thank U sir

@SandBox86 2 года назад

Sir, may I ask, what happens with Eddy currents in the case of a magnet moving really close to a superconductor?

@sparkyinwa Год назад

very nice, you might consider adding a video and include a copper piece with vertical slits showing a reduced effect and tie that in with transformer and motor construction being made with thin sheets of steel rather than solid machined blocks

@sparkyinwa Год назад

maybe i should go through your catalog of videos first,, great work

@timytli2012 5 лет назад

follow-up query. Can you explain what is occurring in the swinging copper sheet as it passes through the middle of the magnetic field (where the flux density is constant). There should still be force exerted on the positive charges in the copper sheet. does this add to 'magnetic braking'?

@beerus553 4 года назад

Jane Hill this is a little late but I’ll explain anyway: when the metal is fully inside the magnetic field there is no change in flux ( since magnetic field is constant along with area). Thus there is no induced EMF and therefore no eddy currents are formed. If there are no eddy currents electromagnetic breaking does not occur.

@mohandasrao6712 3 года назад

Wow op explanation now it's too easy Lenz law is too easy

@lacraftyvegan8316 6 месяцев назад

This was really good 👍

@PhysicsHigh 6 месяцев назад

Thanks

@azk26a 6 месяцев назад

@@PhysicsHigh Hi! Can you please drop your mailing address so I reach out to you privately.

@PhysicsHigh 6 месяцев назад

@azk26a email is on the channel main page

@dizmat.mp3 4 года назад

Thank you habibi this will help me band 6 physics now

@PhysicsHigh 4 года назад

I hope so. Band 6 aren’t easy to come by.

@big6red389 2 года назад

Strange question but would it be possible to take a hollow circular metal core rap the outside with copper wire hook and electric current to the wires to create an electromagnet but then put a round bar of metal that spins inside the hollow circle and be able to slow the bar down by or exert a load on the bar by providing juice to the electromagnet around it?

@KaranSharma-fm2lo Год назад

Very nice idea imagine having one or two magnets fit on the cycle's tyre spokes and the cycle tyre covered with a lot of not whole circular rings but each end connected to wire which has a full wave rectifier connected to the ends , run the cycle and you can generate current

@artificiallift9110 6 лет назад

Really well explained, cheers. And just a question, would eddy currents on both sides of the magnetic field lines be formed or just one on the side which opposes the change?

@PhysicsHigh 6 лет назад

Yes both sides, both that oppose the change. One will repel, the other will attract.

@RainbowChickenWood 6 лет назад

What program do you use to create your videos/animations?

@PhysicsHigh 6 лет назад

I use Promethean Inspire, which is an IWB software. I occasionally use pHet as well, though I recolour with Adobe Premiere for stylistic consistency I use Apple QuickTime for screen capture.

@Momen1984 3 года назад

Thank You so much 😊... I have a question that I hope you can answer , It is said that in electrical instruments the core of the coil is made from parallel wrought silicon iron sheets isolated from each other and parallel to the axis of the coil to increase resistance and decrease the effect of Eddy currents and reduce wasted electricity in the form of heat ..what i don't understand is : how can connecting sheets parrallel to coil axis increases resistance since it is supposed to decrease it and what does resistance have to do with Eddy currents 🤔....I don't know if you will answer but i had to try 😅 THANKS FOR YOUR TIME 😀

@PhysicsHigh 3 года назад

What you are referring to is called lamination. Rather than thinking of increasing resistance, they prevent the creation of larger eddy currents. I do discuss this in my transformer video.

@Momen1984 3 года назад

@@PhysicsHigh Thank You so much 😊

@user-db6cy3xo3m 4 месяца назад

is there any creation of an electric field? im doing a presentation on this topic and was told that there is a presence of electric fields. i thought it was such that Faraday's law creates a electric field within the conductor, and these electric fields are spinning with the train's wheels which then make a magnetic field using Faraday's law again. is this correct?

@PhysicsHigh 4 месяца назад

There would be in order to create the eddy currents

@-mustang-9383 6 лет назад

I would say, the bar will have a emf due to relative motion to the magnetic field, which mean there will be a current and later on will conduct back emf, am i right?

@o.w.dobbins6927 4 года назад

No.

@hmmmmn6770 4 года назад

Wow nicely explained. But my doubt is how does eddy currents occur and work inside a residential electric wire?

@sparkyinwa Год назад

What you are looking for is called inductive reactance and is an important effect in magnetic solenoids, motors and generators. for the wire itself it is there but not a huge effect. Look up AC impedance of conductors versus DC resistance.

@mchappster3790 6 лет назад

R E S P E C T 💖

@ethana1291 4 года назад

mans saved my physics exam

@PhysicsHigh 4 года назад

Thanks for the feedback. I’m glad it helped.

@thelolman2000 4 года назад

What software are you using for you demonstration in this video?

@PhysicsHigh 4 года назад

I use IWB software called Inspire by Promethean

@sc7766 4 года назад

ok but how do those eddy currents actually form? Like what happens insight the material so that the electrons move this certain way?

@PhysicsHigh 4 года назад

Deep down it’s a quantum thing. The electrons, by nature of their properties, charge being one of them, will experience a force in a magnetic field., perpendicular to the field

@HJeff 3 года назад

Magnetic fields exert a magnetic force on charges and move them along a conductor. That's how generators work. The coal or steam power moves a coil in a magnetic field (rotates it) and the magnetic field pushes the charges of the coil along the wire hooked up to it and generates a current.