Eddy Currents, Magnetic Braking and Lenz's Law

Short video made by Aaron MacRaighne, Matt Barr and Fiona Meade - covering eddy currents, magnetic braking and Lenz's Law

[nwachukwuc.obinna]

Thank you Fiona! Excellent explanation, and very clear!!

[jiezhou]

EMF stands for electromotive force not "electromagnetic field". Correct me if I'm wrong

[tonyp]

Very cool. I worked on an eddy current in a scrap yard couple years ago.

[donnymontreano]

do you know why there is a spark in the power switch after the power shut off?

[CalebSaavedra-cu]

Sir good morning, i would like to ask about near field tube testing if what is the formula of it's depth penetration.thank you sir

[littlehills]

id like to see or know can u do this with copper wire
and can u fold sheet metal to get thicker walls. and and what point are u wasting copper in thickness

[danagol]

If you were to force many many magnets through a copper tube, would the copper tube heat due to the current being produced?

[leviterande]

a question: what about iron vs moving magnet, explain the actions. there is eddy currents but differnt from copper, how exactly though, would thank you so much for this

[comingupforeire]

In the first example was there a current switched on?

[fadsmfawopefaw]

Your voice is so soothing - I swear you should voice over documentaries or something.

[Dhriti]

thank you so much for this video. I finally was able to understand eddy currents. Other you tube videos confused me like anything.

[GabbsOnAir]

Why the magnetic field changes as the magnet falls? What area are we considering when analyzing de magnetic flux?

[CplDabu]

So if you reversed the test, and had a magnetic rod without a cut though it, and you drop a non magnetic metal through the tube, would the non magnetic metal go faster or slower than the control test?

[Observer]

Fiona,
  Question:  The secondary magnetic field (green) is perpendicular to the wall of the pipe.  It has no vertical component. If there is a force opposing the downward motion of the magnet, shouldn't there be a vertical component to the "opposing" field?

[filopride]

Can you please explain why the magnet falls much slower through the slit area?

[edyburkay]

Is there a way to calculate the opposing force? How can I find a formulation that calculates the opposing force proportional to velocity? Or currently is it only possible throughout experimentation?

Thanks!

[kimberleymurray]

at 1:25 you say that a current is induced but the accompanying text says voltage is induced?
From my understanding, the magnetic flux induces a variable current. The interaction between these two forces produces an emf which is actually a voltage that opposes current. Is this correct?

[WSKSCS]

I was also trying to do this experiment with a copper tube, but can not find a non-magnetic clamp like the one in your video.Where can I find one of these?

[dr.sonalijain]

You just earned a subscriber. Great video

[grizzledwarveteran]

If u put copper wiring around it can u harness electricity?plz help