A Permanent Magnet That Turns On and Off

In this video I show you how it is possible to have a permanent magnet that turns on and off with the flip of a switch. I show you several ways that a magnetic field can be blocked.

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*Any experiment you try is at YOUR OWN RISK. The Action Lab assumes no responsibility for any injury if you attempt anything you see in this video or on The Action Lab channel.

[raydunakin]

To me, the most amazing thing in this video is the revelation that there is magnetic "paper" that lets you see magnetic fields.

[darkhound]

Next video : turning off and on gravity.

[sweetseremine]

my magnet doesnt work :(
"have you tried turning it off and on again?"

[jamesshelton]

I've seen these used a lot in machining for things like holding dial indicators and have always wondered how they worked. Thanks for the info.

[kimmyhollis]

I'm a welder and these things were a game changer, they help with everything from fit up to simply being a mag vise for easy grinding. the company I worked for owned them and I haven't used them since (there's priorities for my money to disappear to) but I've been looking forward to buying a set of them again

[ksni]

The dislikes are from the electromagnets.

[wow]

Did not expect turning off magnets would require more magnets.

[nuclear]

The Action Lab: Now let's test this theory out with my trusty metal sheet

The Metal Sheet: **KILL ME**

[furtnot]

I love how he is casually using a 1944 steel penny in his tests. I wonder if he knows how much it is worth

[dennisgunn]

I am a 61 year old DIY dabbler and inventor and I am addicted to your show. I usually know what the outcomes of your experiments are going to be but sometimes I don't and I enjoy your presentations either way.

[Amz]

You can also suppress a permanent magnet using Lenz’s law, by coiling a wire around it in much the same way you would make an electromagnet but in reverse. Once you apply a current to the coil when arranged correctly it will suppress the permanent magnet with an equal and opposite electromagnetic polar force. We use this principle in railway engineering. You should give it a try :)

[KingCarrotRL]

The one time that "reverse the polarity" is the correct answer.

[ekeomaeke]

I'm just wandering how he's gonna separate that chunk of steel from that monster magnet.

[yash]

action lab is only popular channel still being real and not that stupid accenty tone and no clickbaits.

he ACTUALLY delivers whats mentioned in title. super amazing.

[DAdamTrammell]

Great video. I always thought the 1943 penny was made from mostly zinc. I never realized they actually were mostly steel, even though they're called steel pennies. I've been wanting a Magswitch for years because they're just cool.

[lastchance]

I appreciate how excited he is about all his experiments. Wish I had more teachers like him.

[fatonisodiq]

I've seen this on my workbench at school and it made me curious about how it works, and here is the answer

[lordshuv-rowyoknow]

You know the science teacher is cool, when he use memes to demonstrate the process

[johnraitt]

When welding frames, you can use a magnetic square that has a mechanical switch on it, once the magnet is "on", the square is able to stick to metal pretty easily, when flipping the switch "off", it interacts with some mechanical components that move the magnets inside the square away from the inner walls of the square, moving them as closely inwards as it can

[l_uxtrous]

I remember a couple years ago I was playing with some magnets I had and figured out that they have values; that they’ll cancel each other out if one is facing north and one is facing south. And now I’m realizing, I pretty much did figure out how to turn off magnets.

I feel so smart.