eddy currents and electromagnetic braking explained
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- Опубліковано 13 бер 2018
- 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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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.
Perfect and very clear explanation, it is always helpful to take a look on internet when studying a hard to visualize concept
Beautifully explained
I like your induced magnets on the plate. Their orientations are perpendicluar to the direction of motion but still they do the job. clever.
brilliant explanation, this is what most teachers lack clarity in explaining...
Thanks
Thank you so much! I just had my class yesterday and my professor didn’t really make it clear. Now I get it!
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 :)
Awesome... understood clearly..thanks
Fantastic explanation!
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.
GITA
Thanq sir for clearing my doubts
It is really helpful . Thank you again
My phsyics teacher is an absolute clown. Can't explain anything.
You sir, are fantastic. The conceptual framework is brilliant.
THANKS ITS WELL EXPLAINED
Very nice explanation
Excelllent explanation
thank u so much very clear!!
Great explanation
Very well explained sir! Thank you!
You’re welcome.
wow awesome video Thank you so much !
Wonderful demo sir
sir nice explanation
thankyou
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
Thanks a ton!💯❤️
Thank U sir
Articulated nicely!
Great job
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'?
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.
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?
Yes both sides, both that oppose the change. One will repel, the other will attract.
This was really good 👍
Thanks
@@PhysicsHigh Hi! Can you please drop your mailing address so I reach out to you privately.
@azk26a email is on the channel main page
Sir, may I ask, what happens with Eddy currents in the case of a magnet moving really close to a superconductor?
What program do you use to create your videos/animations?
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.
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
maybe i should go through your catalog of videos first,, great work
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?
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
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 😀
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.
@@PhysicsHigh Thank You so much 😊
Thank you habibi this will help me band 6 physics now
I hope so. Band 6 aren’t easy to come by.
Wow op explanation now it's too easy
Lenz law is too easy
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?
No.
Wow nicely explained. But my doubt is how does eddy currents occur and work inside a residential electric wire?
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.
What software are you using for you demonstration in this video?
I use IWB software called Inspire by Promethean
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?
There would be in order to create the eddy currents
mans saved my physics exam
Thanks for the feedback. I’m glad it helped.
R E S P E C T 💖
ok but how do those eddy currents actually form? Like what happens insight the material so that the electrons move this certain way?
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
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.
This is like kelvins thunderstorm, where the positive water goes to the positive terminal and vis a versa.
How does eddy currents do electromagnetic braking, you didn't explain the crucial part.
ua-cam.com/video/yU_wwWC-K9c/v-deo.html
The new magnets that are created by the eddy currents attract the magnet and slow the moving plate down.
@@HJeff they don't attract they repel, polar opposite, if they attracted they would speed up
Actually both. Lenz law. The front repels to oppose motion. The back attracts, to oppose motion.
@@PhysicsHigh if one repels and one attracts doesn't that cancel each other out into a net zero?
This professor has a slang as that of Forest Gump😍
Any indian?
Sir you teach really well but your accent is really creepy
Us Australians have no accent. 🤣
not the best i've watched