Electromagnetism

[mortenrobinson]

BTW all, there is no such thing as a real short circuit. All electrical conductors will have some resistance. A very small resistance such as this copper-wire just means that a lot of current will run. This will result in more heat being generated. Another important fact when working with electricity is that the hotter a conducting material becomes the more resistance it will get. So "shortcircuiting" a battery will cause higher internal resistance in the battery and more resistance in the wire

[comfortablynumbb]

if opposites attract, why is the north needle of a compass attracted towards the north pole of earth and not the other way around?

[techneon]

wait a second.. at 8:07 wouldnt the compass be the south and the other be the north? Because the compass attracts to the opposite? The red end (which finds north) would have have to be south because it attracts to the north. If im wrong please someone explain?

[twhouser]

silverbull : the electricity is induced into the nail and becomes electromagnetism, if two insulated wires are wrapped on the nail you have made a transformer and the electromagnetism is reinduced and becomes electricity again,at this point the nail is no longer a magnet it's potential being disipated

[BogMonkey53]

is the wire wrapped around the nail insulated? I can't see how this would work with uninsulated wire. Wouldn't the current flow through the nail itself?

[TheOldred101]

That's correct.  The earth's north pole is actually the magnetic south pole.

[sector1037]

QUESTION:If the "north part" of the magnet is attracted towards the earth's north pole does it mean that the "north part" is actually the south part? opposite attracts and same repel right?or the north pole of the earth is actually the south?

[Lonlywolf89]

very nice video....

few other facts:

there are elctro magnets, permenants magnets and time magnets (lose power as longer time goes)

and also the world has an electric-magnetic "stipes" going from south to north and those stripes are attracting the needle of the compus not the north pole

[ATAReaver]

TNX!! dude super Cool

[mrvasmisla]

No. Oersted did his experiment in 1819. Electron was discovered in 1895. So, Oersted was clueless what he discovered.

[imanoob4]

was the electron discovered when the danish guy discovered how electricity and magets connect?

[harshm2u]

I noticed that even when the circuit was broken, the nail didn't lose its magnetic character. 9:20. What's the explanation for this? Does it take time for an electromagnet to lose its magnetic lineament, once the circuit is broken?

[DeaconSwayne]

What you saw there is called 'residual magnetism'. Some of the magnetic flux remains in the iron core (nail) even after the coil current has been disconnected. This occurs because it is possible to magnetise certain materials.

[SKH93]

The nail made frm hard magentic material. Hard magnetic material is more difficult to get magnetised but if you connect the circuit long enough for it to be magnetised then it will retain its magnestism even if the circuit is broken. Hence the nail is able to attract the paper clip. Steel is an example of a hard magnetic material.

[Maticus2009]

The magnetic cloud takes some time to dissipate.

[jeffrey76117]

Thank you very much! Very professional!!

[pawningcity]

Nice! thanks!  :)

[tramzi2002]

Excellent! Thankyou.

[nonameatallbuahaha]

very interesting!!

[Trivialnights]

really good video. Thank you for putting this up. Really appreciate it.

[USArules7996]

I know this isnt related but I need advice on how to get my invention idea tested and pattend, because it will be hard because im a kid.

[rikasley]

If you have a lighter you can burn the insulation off.

I like that trick with the rubber band.

[footballover01]

nice and intuitive

[ms1999porscheboxster]

thank you so much this movie is very informative

[Nickdowg25]

Thank you very much very helpful but, I went onto your website and I was trying to find out how to make the switch to turn it on and off so could you please tell me how to make it. Thanks

[morrismonterroso]

thank you. very professional,excellent.

[laughingnightmare]

does it matter if the wire closest to the flat part of the nail is connected to the positive end of the battery and the wire closest to the pointy end of the nail is connected to the negative end of the battery? i really hope someone could answer that.please?

[Lyllithx]

Excellent! Thankyou.

[JimboJonesManifesto]

looked like a buffalo nikel

[feoinfunroe]

A modern "nickel" (American 5-cent-piece) will not stick to a magnet. However, I've found euro coins that will stick to a magnet, because they have wound up in my change and stuck to my magnetic money clip. Just thought I'd mention it.

[malibu2001]

wow nice I seen this magnets on junk yard pick up cars and dived iron from other metals, but my question here is why iron creat magnetic fields and why magnetic charge metal like magnet atracts the magnetic fields of the earth and why electricy charges in atomic level charge other non metalic object like your hair and boloons, how much energy can electricy can be charge to create anything elctromagnteic?

[psyfertech]

what is weird is i tryed this exactly how you did but it didnt work so hmm, i guess i did it wrong or something

[cupiiid]

Thanks, very helpful :)

[silverbull]

I have a question and it would be great if some one could answer it, if some one already asked it sorry I didnt see it. What I am wondering is that why doesnt the circut overload as there is no load in the circut to convert the energy into something else. If some one could answer this it would be great.

[ScienceOnline]

The 1.5 volt alkaline AA battery has an internal resistance, this combined with the resistance (very small) in 5 meters of 28 gauge wire reduces the current flow so the coil does not overheat. A battery with a lower internal resistance or higher voltage would cause the coil to get too hot.

[MattZildjian]

when finding out the polarity of the electromagnet by checking it against the compass, u said that because the north pin of the compass was attracted to that end of the nail, it must be the south side, but surely the pin on the compass that points north must be south, so that it attracts to north. or am i going mad.

[ScienceOnline]

The North end of a magnetic compass needle is the "North Seeking Pole", ie. it is attracted to the North Pole of the Earth. This is how the north pole of a magnet is defined.

You may recall that with magnetic poles "opposites attract", (North attracts South) so to add to the confusion we must have a south "magnetic" pole at the North End (Pole) of the earth! If this isn't confusing enough, apparently every now and then (thousands of years) the earth's poles reverse!

[PhotographersAcademy]

That looks very much like a short circuit. I think you would flatten the battery very quickly. It would be safer to add a 1.5 volt light bulb in series to keep the circuit safe.

[ScienceOnline]

As mentioned in the video this electromagnet must use a 1.5 volt AA battery, even with this small battery the coil will get very warm. A bulb in series would probably reduce the strength of the magnet considerably.

[xxJust2340xx]

lol cool guitar magnet =D thanx for the video

[WhiteMorphageus]

thanks man; i always wondered which way the current flowed from a wire!; but can u tell me if this statement of mine is correct: "the north pole(of the electromagnet)lacks electrons(positively charged)."; thanks so much!

[ScienceOnline]

Electrons are responsible for magnetism but the physics is complex and involves electron "spin".

[brax777]

Very good. Thanks.

Could you explain how a battery establishes the Electrons ?

[daregularperson]

the different elements actually give off electrons to the other elements (but im no expert)

[jake17000]

Electron is the base word in Electronics so if the battery is the device that provides power to an electronic naturally hooking it up to a magnet via a wire establishes the Electrons simple

[ogfkid]

nice

im tryin it