Lenz's Law with Copper Pipe (H16) [5K20.25]

A magnet is dropped down a conducting copper pipe and feels a resistive force. The falling magent induces a current in the copper pipe and, by Lenz's Law, the current creates a magnetic field that opposes the changing field of the falling magnet. Thus, the magnet is "repelled" and falls more slowly.

[rmsv]

View from above definitely makes it worth watching.

[ggaggagga]

We used to demonstrate this effect to new trainees in MRI. We'd use a large aluminum pizza pan. Standing on edge, we'd release it aligned with the field in the bore and it would topple normally. Change the direction it would fall to align against the field and it would take a leisurely trip to the scanner couch :)

[newwaveinfantry]

0.02s seems very wrong. It's not enough time for the ball to fall through. By using the formulat y = 1/2gt^2 you get that the tube is less than 2mm long. I think you meant 0.2s.

[danielbengtsson]

If an elevator had a huge magnet underneath it's floor, and it fell through a pipe where the bottom part of it was made of copper, would that then dampen the fall for a smooth stop? I'm picturing a dampening effect sort of like what you would have with soft closing drawers, or would that take too powerful a magnet?

[malekzalfana]

The way he walks at the beginning looks so funny for some reason. Or maybe I watched teller way too much

[Roonnam]

could that principle be used to slow down a falling elavator.. would that frictionlike effect offer more resistance when it is pushed down ..?

[НатальяГригорьева-иэн]

What are the parameters of the magnet: weight and diameter, as well as what is the length of the copper tube, its internal and external diameter?

[mr.mohiyuddin]

U make it understanding very simple....

[indigodragon]

Could a stirling engine be designed with magnetic piston heads that kicked opposing magnets at the tops of the cylinders with the magnetic cylinder heads passing up and down in copper sleaves to produce a steady electrical current from the lens effect?

[thegangsta]

Magnet passing through the tube would induce emf which will drive induce current across the tube. Now the induced current would possess direction such that it's magnetic field (as current has magnetic field around it) would oppose the change (motion) causing it/ generating it. It's your so called as Lenz's law. Now my question is that what would happen if we use iron tube? Will emf be induced there?

[seongminpark]

what would happen if we cut a chunk of the copper tube out? (in the falling direction)

[primodernious]

the magnet want to move with the induced magnetic field. the induced magnetic field is created after the electric field and want to create a stationary field. if the induced field had been moving with the magnet it would have caused the magnet to fall freely trough the tube, but since the induced field is stationary the induced field resist the moving field and gravity have to overcome this resistance in order to get trough the tube.

[valiyan]

Is there any why magnet doesn't move in tha... And stuck between the pipe, i think so its only possible when resistive force is more powerful then magnetic force?... Can tell me that i am saying true or not?

[raokhalidmehmood]

What will be the final acceleration 'a' inside the tube? Please give me the answer?

[sobharani]

What is the emf induced in it?.... How to derive the general formula for that?

[primodernious]

the induced emf is not evenly distributed inside the tube but is stronger close to the magnet than further away.

[V-Trix]

What kind of magnet should we use for doing this experiment ??

[athenes]

Изменение потока магнитной индукции, проходящего через незамкнутую поверхность, взятое с обратным знаком, пропорционально циркуляции электрического поля на замкнутом контуре, который является границей поверхности ... теоретический.

[thirugnanasambanthanr]

There is any other material is used instead of copper

[Rahul-ojkq]

Why did you use tube and not solenoid?