The Case of the Charged Comb (ElectroBOOM101-002-01)

Hi someone called 903theBest left a post in electro boom subreddit and asked very good questions, so I had to make a quick video We know electric current is the amount of electric charge per Coulomb passing per second now if we get a plastic ruler and rub it against animal fur and charge it and then throw it. Can we say electric current is flowing? Does it create magnetic field? What the current flow is when there is a voltage difference? Where's the voltage is it created when the comb moves? If I vibrate it does it create electromagnetic fields? What if the charge is stationary and the observer moves will there be electric potential created? What do you think? Pause and think about it. the answer to all these questions? Is yes answer number one Yes if we throw a charged ruler it is considered electric current if we put one Coulomb of charge on the ruler and Throw it at a speed of one ruler length per second It will be one amp of current Now answers three and five are related would we have voltage potential if the ruler or the observer move? Yes! If you have watched my last video You know that voltage is the amount of available potential energy per unit charge or Joule per Coulomb For potential energy to exist we don't need anything to move if we have Q amount of charge on the ruler at any point in Space or metres away from the charge We have an electric field Equal to this amount which has the potential to spend energy on any charge present in this spot Which means that we have electric potential and if anything moves through the electric field of the ruler no matter if the ruler or the observer is moving we create voltage. Look at this experiment I place my multimeter here measuring millivolts the probes are not touching anything, and if I bring my hand close It's not picking up any voltage Now if I discharge my ruler and bring it close it still doesn't pick up much voltage, but if I charge it and then bring it close Look at that I'm making a lot of voltage across the probes Isn't it great? I'm making voltage by manually moving charges Now if I stop moving the ruler the voltage drops back to zero because the meter circuit resistance diffuses the electric energy at the probes, but as soon as I move it I have voltage and of course the same thing happens if the ruler is stationary and I move the probes Now let me show it to you on the scope. I have my scope probe here and My discharged ruler. Now if I charge the ruler and move it around the probe You see that I'm creating voltage waves isn't it awesome? What you don't share my sense of joy? Answer number two? Yes, moving charge or electric current creates magnetic field let's try it I'm passing 10 amps through this *ow* hot Anyways, 10 amps through this wire now if I bring my charged ruler close And move it around hm It's just attracting The hell- oh ---- I know Well in a wire when we run DC or low frequency AC Current the positive and negative electric charges are pretty uniform and equal So the electric charges cancel each other and all we have is magnetic force, but in my ruler I have static electricity that even now that I don't have any current running through the wire it Attracts the charges in the wire the electric force here is much stronger than the magnetic force If there was only magnetic force here I would expect the ruler to Attract the wire when I moved it one way and repel it when I move the other way, but now it's just attracting So although it's creating magnetic field. I can't demonstrate or measure it here Do you remember Coulomb's law from my previous video showing the force between two charged metal balls? It only works if the balls are Stationary as soon as they move the magnetic field created between them affects the force The wire melted the ---- out of my plastic clamps and Finally answer number four of course if I shake it It makes it after all it's filled with charges that create electric fields around it And I'm shaking the fields creating electric waves in the universe and of course moving charges are electric current Which makes magnetic fields in space too- it's funny, though in a wire at low frequencies? We pretty much only make magnetic fields because like I said the opposing charges are equal and pretty Uniformly spread but with this ruler I'm making electromagnetic fields probably more electric than magnetic even it was a very good question novecientos tres the best Thank you. No, this was a good question, and I thought to make it public But I don't want to spam my channel with the follow up videos to my electro boom 101 series so later if I want to Make quick general follow-up videos to my electro boom 101 series like solving problems and answering questions ill just make it private and i'll put a link to them in my website electroboom.com so if you're interested to learn the supplement information you can go there and watch them *ending theme music*

Channel: ElectroBOOM

Views: 792,723

Rating: 4.9702101 out of 5

Keywords: educational, electrical, electroboom, electronics, engineering, entertainment, equipment, mehdi, mehdi sadaghdar, arc, mishap, physics, Sadaghdar, science, test, tools, circuit, funny, learn, shock, spark, electron, proton, force, gravity, mass, voltage, current, electricus, electricity, definition, newton, coulomb, energy, power, watt, ampere, volta

Id: 8qyN3K5EE7o

Length: 5min 38sec (338 seconds)

Published: Fri May 04 2018

Reddit Comments

[u/PM-ME-YOUR-UNDERARMS]

Rather than making them private, you could make a separate YouTube channel. There are many people not on Reddit who would have missed a great question if it was made private

[u/eatyourheartout01]

And great video by the way!!!

[u/jeffhuys]

So, what if you charged a capacitor up to high voltage, take off the plates and move the dielectric material around?
I think you’d have power that you could actually use?

See this video, where someone made a dissectible capacitor:
https://youtu.be/NQO-p_ff0Xs

[u/PM-ME-YOUR-UNDERARMS]

Congrats /u/903thebest!

[u/eatyourheartout01]

You should talk about semiconductor in which you could being up transistors or diodes. You can bring schrodinger wave equation and tunneling. Also bohr and de broglie. You could set up the different experiment they did to show how they got to their conclusion. It would be very entertaining and interesting

[u/_EMC3_]

Great video, but in the last videos you are not blowing up stuff like in the old times. Btw you could have tested the magnetic field with one of those sensors sold as "electronic compass". These are cool devices, i advise you to get one... example of a really good sensor unit: http://www.st.com/content/st_com/en/products/evaluation-tools/solution-evaluation-tools/sensor-solution-eval-boards/steval-stlcs02v1.html

[u/Utkarsh432]

HOW DO WE CREATE OUR OWN CYCLOTRON??

[u/francium99]

I need your help is this video for RC Fake because it looks fake. https://www.youtube.com/watch?v=xv936fnznWU

[u/Fox_Tango]

I have come back to Reddit after being gone a while thanks to this video.

With the idea that a current is created when a static charged item is moved. Does that mean a person charged with with static can punch someone and pass the current in the form of discharge to the person they struck? Does physical transfer of momentum affect the discharge current?