Here's a Question! - Magnetism and Fire
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- Опубліковано 26 лют 2023
- A paperclip is straightened out, except for a loop at the end, and is loosely hung from a staple that's been inserted into a block of wood. The free end of the paperclip is placed close to, but not touching, a strong magnet so that it doesn't fall down. A candle is placed under the paperclip's free end. The candle is lit and the flame touches the paperclip. What happens to the paperclip?
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#curietemperature #curiepoint #magnetism #heresaquestion
There's a UA-cam channel called Technology Connections. The first video I saw from him explained how early electric rice cookers were designed. A spring pulled a switch open, but weakly, and when ths user pushes the switch, the switch was then held closed by a magnet, that pulled stronger than the spring. The materials were designed so that the magnetic attraction would disappear, like in this video, just above the boiling point of water. As long as there's water in the pot, the circuit will stay closed, and the heating element would stay on, and as soon as all the water's gone, the temperature will start rising again, and the rice cooker would automatically shut itself off because the spring pulling the switch open becomes stronger than the magnetic effect that disappears. I subscribed to the channel just on the basis of seeing that one video.
Very very very cunning!!!
Oh man I liked this one, simple but it's a great feeling to go through each possibility and discard them until you get the correct answer.
I guessed correctly, but had no idea why. Now I do! Thanks, JL! 👍
Very informative 😀
Wow! First of all, science is so cool and secondly, you guys are so cool and thirdly what happens if we burn a magnet?😅
A. Heat demagnetize most metals. As for melting the paper clip..., the flame of a candle isn't hot enough
Why didn't the candle have the blue flame, no vaporising wax?
Also, will heating and cooling magnet affect it?
@1:06 The suspense is killing me..
After the paperclip cools does it regain it's magnetic ability? (or whatever it's called)
Yes. Once the temperature goes below the Curie Point, the paperclip can act like a magnet again. You can sort of see this happening in this video. The paperclip 'wavers' for a bit because its motion is, apparently, moving it to a cooler region of the flame where (enough of) the paperclip can retain its magnetism.
Awesome. Thank you :)
Niceee
My guess was that nothing would happen. I'm aware of Curie-temperature but I simply expected the magnet to exert a stronger force to keep the 'molecular magnets' aligned throughout, thus keeping the ferromagnetism similar to paramagnetism. Interesting that the energy added by the heat is so much bigger so they can no longer align long enough.
I assume those were small neodymium magnets, so they are quite strong.
Yes, those were small neodymium magnets.
Why didn't more domains line up with the magnetic field once heated?
Too much motion due to the thermal energy to keep things aligned with an external field.
@@JeffersonLab Ohhhh, so if it was held in place and allowed to cool, it would be magnetic?
Yes. The field would 'freeze' in once the temperature dropped below the Curie point. This effect records the direction and relative strength of the Earth's magnetic field as the ocean floor spreads.