Electricity & Magnetism Hand Rules (part one)

[MrJonkelp]

really informative and interesting

[31896eneri]

when he switched the direction of the wires it will make red negative (red -)and black the positve(black +) . So the thumb must now point to the right (red to black).flip the left hand over so palm faces downward to make the thumb point to the right. The direction of the magnetic field didn’t change so the fingers still points out of the screen.that will make your palm face upward.

[Cnupoc]

i have a question which is not related to the video but i cant find anything that can answer it. Can an electric motor CREATE electric power instead of consuming it, if it's connected by a magnet self-running motor, using motion to create energy ?

Can an electric motor become a electric generator if the whole thing is reversed ?

[guitarFAIL]

seriously what's with that tie

[mindfuckerification]

i have a question that i cant seem to find the answer. how do you create a positive charge. Since electricity is moving electrons wouldn't allways be negative? Would a positive charge be moving protrons?

[NASAsCO2LIES]

10 points to anyone who can tell me how fast the electrons actually flow? (trick question)

[26fonzi]

@NASAsCO2LIES haha, not very.

[kami645464]

Good video first off.

What I don't get is why can't you use the finger rule in this situation? Where the thumb points to the direction, the first finger to field and second finger to conventional current. If I do it according to that, I end up with my thumb pointing upwards not douwnwards in the first case. Why?

Anyone explain?

[HINIELD]

@kami645464 What he use is the same as Fleming's Left hand rule for left hand. It is the same. as long as magnetic field, direction of current, and thrust of force are in perpendicular,

[CJFRANKS7]

Hey, this is better than the public school system!

[Neomundus]

PLEASE watch the video The Electrinium Battery, and read the book. Goodspeed to you all.

[antizero100]

oh my GOD!!! you don't know how annoying it is when people say turben instead of turbine, get it right!!!

[NeigborhoodBoards]

dude that made no sense ur going waaaay too fast

[song110beforgiving]

Why do you start out saying 'electricity and magnetism aren't intimately related?

I was taught they ARE related.

You also don't speak clearly, sounds like your sinuses are clogged.

[ironspring]

I had a teacher try to convince me you could use the right hand rule for bar magnets -.-

[IAbominator]

What power supply did u use, is it better to use voltes or amperes and where did u get it from ps great video

[VAVAGNER12]

portugues:que droga

ingles:shit

[fraghetti]

thank you alot for this. also a huge thanks to the captions, since i have problems understanding spoken english.

[violafinishda]

Free energy can change the world!But Millions are spend in supressing that information,Get a motor that needs no gas or electric input at LT-MAGNET-MOTORdotCOM ,Free yourself!

[oOAstarOo]

Awesome vid...so helpful! Thanks :D

[gamehacker2point0]

chi.... 

[d0q3]

gtfo didnt understand anything

[MrAlarine]

Nice tie !

[pithikoulis]

I have a question: As you say the force is applied on the charge. Why does that make the whole foil move upwards or downwars? Is it that the magnetic field pushes the electrons upwards while they pass through the foil or did I grasp it wrong?

[dcolarusso]

@pithikoulis that's the basic idea. The current moving through the wire is made up of electrons (charged particles) and since they are moving through a magnetic field, they feel a force, either up or down, and they carry the foil with them.

[1091Floyd21]

How come with situations regarding Fleming's left hand rule, the magnetic field lines are always straight instead of curved? The way I see it is; they should be curved. Unless they take the tangent to the curved line as being the direction of the magnetic field. And even if they did this, because a current-carrying conductor may be so long, the direction of the force on the conductor would be different to the direction of the force on the other side of it? I do NOT understand!

[KeepingModern]

This should be useful information for building a solenoid gun.

[MinoFilm]

make a video about schrödingers cat!

[dnmn8r]

Hey great and very helpful video.

Just one question, you said that "DC current is the movement of a negative charge". I'm not sure if this is just an Australian thing, but i thought that in physics we always show current as the movement of a positive charge (and not the electrons).

[dcolarusso]

dnmn8r, When the study of electricity fist began, people were under the impression that it was the flow of positive current, we have since discovered that it is in fact the movement of negatively charged electrons. Because of this historical accident, however, we sometimes still refere to this imaginary positive current. When we do, it usually is called "conventional current." It gives you most of the right answers, but doesn't actually reflect reality. I'd suggest Googling conventional current.

[TheWaffler1]

@dcolarusso This is correct, the conventional current is in the direction of 'positive flow' (which doesnt actually happen) In my Australian Physics class, we learnt the "Right Hand Rule" in which the thumb pointed the direction of conventional current, everything else the same. (Seen as most circuit diagrams are drawn with conventional current notation)

[CV22gunship]

@dcolarusso totally true !



[siloPIRATE]

@dcolarusso They should just fix their terminology and remove Conventional Current completely from the whole thing and save confusion. It's so much simpler, but no, Physics had to be stubborn

[MrGrzv]

@dcolarusso Hi, nice presentation. Let me add something to the debate. Yes, electricity is movement of electrons. Yes, they are negatively charged. But! Their charge is also matter of convention. Electrons don't know whether they are positively or negatively charged. If scientists agreed they carry plus on their small shoulders, they would be perfectly happy with it. Science is loaded with such conventions leading to misunderstanding between physicists, chemists and mathematicians...

[Vanze42]

Thank you for sharing. It helped me a lot with understanding new concepts.

[dcolarusso]

Thanks. I'm glad you found it useful.

[1091Floyd21]

With regard to a loop of wire carrying a current: How do you know which side of the wire behaves as a north pole, & which behaves like a south pole? It's not as if one side has the magnetic field lines coming out of it and the other side has the magnetic field lines going into it, BECAUSE according to the right hand grip rule, the magnetic field lines are of a uniform distance all around?? Any answers, appreciated. Thanks

[dcolarusso]

@1091Floyd21 this involves one of the hand rules not discussed in this video. However, the direction of the magnetic field surrounding a current carrying wire can be found using these additional hand rule. That being said, if you are viewing the loop in such a manner as to see the current moving in a clockwise direction you are looking down on the north pole of the loop. The wikipedia entry for "Magnetic field" does a pretty good job of laying this all out. I hope that helps.

[Theryolinator]

Quote: basically, a charge moving through a pre existing magnetic field will feel a force.

what does this mean? pre existing magnetic field

[dcolarusso]

In this case, I'm referring to the magnetic field produced by the magnet. The point is that if you have a magnetic field and you move a charge through it, it will experience a force. I used "pre-existing" because moving a charge actually produces a magnetic field, and I wanted to make it clear that I was talking about a field in existence before the introduction of the moving charge.

[phatty122222]

dumbo! fleming's rule is easier

[Srlancelot39]

@phatty122222 dumbo! he's not teaching fleming's!

[SalviaDivinorumBlog]

electricity flows from positive to negative not from black to red.

[Plystire]

@SalviaDivinorumBlog : The electrons flow from negative to positive, but the current is said to be flowing from positive to negative. I may have gotten that backwards, but in any case, one of them goes one way and the other goes the other way. Hope that helps :)

[SuperMagnetizer]

@Plystire Yes, you got that exactly right. Also wrapping the fingers of your LEFT hand around a conductor so that your LEFT thumb points in the direction of ELECTRON flow, your fingers show magnetic field orientation.

[Csabesz87]

OK but its booooring

[b0801tc]

lol at 1:22 it sounds like erection of...

[Diemedes]

While this is quite helpful (I guess), they should really teach the concept of the cross product between two vectors. That's the only thing I know, no palms, fingers, etc. Just the right hand rule.

[lseateal]

huh?

[zalmi1]

Good right & left hand rules. You learn that in physics

[tulaconalas]

i still dont get the hand stuff he told.. well

[CaptainofSquad14]

if its a negative charge use your left hand, point your thumb in the direction the charge is moving(i.e. black to red) and point your other fingers the way the charge is moving(i.e. S to N) then the direction your palm will push tells you which direction the foil will be pushed in

[Snotrocket1000]

is it always S. to N.? or only when the current is going from left to right?

[CaptainofSquad14]

yes it is always S to N. the electric current has no effect on how a separate magnetic current acts

[gregrutz]

research 'cross product',

like a gryo, move it up and it wants to go 90 degrees to that movement. sometimes call the 'right hand rule'

[eddie2042]

ya we use the right hand rule. thumb to positive movement, fingers to motion of magnetic field lines; palms in direction of movement. i think it was

F(magnetic) = q . v . B . (sin x)

q = charge of object enter magnetic field

v = velocity at which it enters

B = magnetic field strength

x = angle between motion of object and magnetic field.

[sprinkleOFkawaii]

SoMeone HELp

1. A positively charged particle entering a 0.52Tesla magnetic field (directed out of the paper) has a speed of 270m/s and moves perpendicular to the magnetic field. Just as the particle enters the magnetic field, an electric field is turned on. What must be the magnitude and direction of the electric field such that the netforce on the particle is twice the magnetic force? Ans: 140 V/m directed toward the bottom of page

[krankiev]

the question at the end is stupid... he says right in the video that if the current flows inline with the magnetic field that nothing happens..

[TonganSoIja63]

you learn more on youtube then in schools..Its even way more entertaining so you tend to listen more instead of wondering off..

[JAGGERNAULT1]

@TonganSoIja63 STFU

[JAGGERNAULT1]

@JAGGERNAULT1 NO YOU STFU

[Cnupoc]

@JAGGERNAULT1 O_o internet schizophrenia ? 

[starsoffyre]

Ummm...isn't electricity the flow of electrons?

[buminachair]

AHHah hahHAH ha hAH hah HA epic fail

[wtflolomgwow]

electricity is a form of energy. energy is used as a concept to help scientists wrap their heads around different forms of energy. and by the way, the flow of electrons is called current.

[haesther]

Great video, and a great idea... using youtube for more than just wasting time. Free education... who knew.

[Arguimbau33]

I don't go to school I youtube

[charlsielem]

...and i learn more. lol

[electronic396]

so so true....

[UlTrA2GaMeR]

@Arguimbau33 :D I hear ya

[JAGGERNAULT1]

@Arguimbau33 YOUTUBE SUCKS

[aceshigh1091]

ty.

[safebladgetme]

im sure you have the north and south poles mixed up, or current flows in other direction to the one which you say. use the left hand rule, the wire should move UP, in first experiment, since field acts in direction north to south and current flows from black to red as you say. think about it.

[tjawatdan]

your a genius...

tomorrow i have a exam about this subject and before i saw this i didn't understood.

next time do it a little bit slower. but THUMBS UP!!!

[7188181]

By the looks of your spelling, you're definitely NOT a genius.

[CalxCastor]

Neither are you, I'm afraid. His spelling is perfect. You're thinking of his punctuation and grammar...

[CalxCastor]

You explain it too quickly! Besides, I am more familular with the other rule: Thumb = Motion; forefinger = North to South; and middle finger = flow of current.

[7188181]

No, you're just too SLOW.

[amirfarid91]

why does condemning a trend here? i doubt any of u wise-asses are THAT smart anyhow. so stop picking on others and wipe ur own shitty ass

[ISRAELITECHURCH]

Is aluminum magnetic?

Is aluminum an electroconductor?

What did the electromagnetic field supply?

Thanks. Interesting stuff.

[grrumpff]

no, aluminum is not magnetic.

yes, aluminum is an electroconductor. :D

I dont know the answer for the last question though...

[timothyp2009]

every type of metal can be turned magnetic by running a current through it

[saifrizwan]

thanks a lot for all the videos you've posted they helped me a lot!

[frostwow]

thanks mate

[Kitt0000]

An interesting way to visualize, thanks for sharing.

[electroninstructor]

That is an excellent video, in the true spirit of open source sharing ! We were just talking about hand rules in my electronics class. This is a very useful educational tool for students and teachers. I love the demonstration using the foil across the magnet. Brilliant !

[WDX7770243546]

try it in the microwave please.

[hthglllkhgjg]

yea cuz you think the electric field is in the direction of the proton

lol

150 year old news flash, ELECTRONS are the current not protons

[mumpoopoo]

this video is useless and retarded...

[carioca1983]

You are retarded.You'd better thank the person who posted this video, moron

[Mythmakers]

.. go wank off

[kycaper]

haven't you heard of using the index finger for the rule