Introduction to Electric Fields

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A simple and comprehensive introduction to electric fields. Covers the basics like the electric field of a charge, electric field lines and the electric field equation.

Hi! I'm Jade. I make fun physics videos that will make you smarter while making you smile :) Subscribe for new videos every second Thursday!

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So you put two positive charges together, and no surprise, they repel. Simple right? But WAIT! What IS that mysterious repelling force? Turns out it's the electric field.

All interactions between charges are because of their electric fields. But electric fields are not uniform, that is, they vary in strength depending on their distance from the charge. So how do we visually represent this? ELECTRIC FIELD LINES. Electric field lines give a visual representation of the varying strength of electric fields. They follow two simple conventions: 1 - field lines of positive charges point out, and field lines of negative charges point in - 2 - a high density of lines represents a strong electric field and low density of lines represents a weak electric field.

The definition of an electric field at a point is E = F/q where E is the electric field, F is the force felt by a test charge placed in the electric field and q is the magnitude of the test charge.

Thanks for watching!
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You make it sound so easy! This kind of delivery is really helpful esp.for students who will do much of their school work at home this school year. Thanks!

mariateresaabanes
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So great! Thank you huge! Class overcomplicated something I was already comfortable with, and your video completely alleviated all the anxiety that I subsequently developed. Thanks thanks!

DanielInfrangible
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small correction at 1:25 saying charge doesnt have mass is misleading, as charge is always associated with mass as it is dependant on it. (positively charging an object makes it lose mass, and negatively charging it makes it gain mass, although negligible).
a more accurate explanation would be the mass of these charged particles are so small that the effect of gravity is negligible and cannot cause them to be attracted to each other showing that another force is at play which can be either attractive or repulsive unlike gravity
love your videos ♥♥

niy._.
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We take the direction of electric field lines away from the positive source charge because we take the test charge to be positive. But on the other hand, if we will take the test charge to be negative then we will take the direction of field lines towards the positive source charge. Am I right?

mukeshchand
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I like how this video starts as it clearly states how little we know of the dielectric field as C. P. Steinmetz called it.

Nikola Tesla was a specialist in this field, and found out that sudden disruptions, in other words, changes in the dielectric field strength, caused Longitudinal wave effects.

I say effects, as he experimentally displayed these so called Radiant Energy effects.

Tesla used High voltage DC fields which he discharged using opposite polarity voltage impulses, created by coil discharge inductive spikes.

I am successfully researching this using my coil capacitor.

more info on my channel

MasterIvo
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you have got to be the greatest physics teacher. simplified everything and now I understand thank you.

athanb
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Well done. So MANY videos are almost frenetic in their pace with a rapid chat and music video editing making it impossible to get anything out of it. This was the best explanation I have ever seen. My only request is that you might want to explain WHY fields came into play in the first place. That, to me, adds to understanding. Keep this up. you have a winner of an idea.

JackKirbyFan
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You’re the best happy holiday you saved my semester

anysianas
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Your teaching style and your knowledge is very well and helpful

dhrumilpatel
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Good video..How about direction among negative charge..why they repel each other

Chakoti
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At 5:26, you have the positive charge moving towards the negative charge.  I thought that it is always the negative that moves to the positive charge, e.g. in  a simple circuit, the electrons leave the negative side of the battery, flows thru the wire, then flows into the positive end of the battery.

BoxerDogs
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I just discovered your channel, and it is so helpful.

Bandarr
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Finally a science channel with a good-looking narrator.

mojave
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I am a student of commerce, I may not be able to solve problems, but I understood electric field so well that I can even explain to other students of science stream. #thanktoyou

adi
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Really helpful, whenever I'm looking up a physics subject and I see you've covered it I'm sure to watch your video!

claricehardman
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can u please explain me how a electron-electron repulsion take place ...
i couldn't understand its field lines....
Answer me plz Thnx

kezhilvendhan
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Since F is the electrostatic force exerted on the test charge q by the electric field E (which is sourced by the initial charge) the electrostatic force that relates the electric field to the test charge should be the same force as that in Coulomb’s law since both equations include the force between two electric charges…one in terms of the magnitude of both charges (Coulombs law) and this one in terms of the electric field associated with one of the charges.

abe
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hello teacher ! how are the charges separated for practical purpose and what are their sources can you describe it ?

sunahangrai
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i have something similar to mild dyspraxia and i'm also half deaf so my way of learning is really a bit unusual but easiest way to put is is I'm a very slow processor. There's something about the way you pronounce your words where you have little semi pauses between them that aren't normally there. For me, this is very nice because it gives my brain and ears quite a lot of help in processsing. I love your pictures and girly way of doing it, it really helps me :-)

ilaila
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Excellent presentation and communication technique. Refreshing and authentic. Well done and keep it up! :-)

cet_learning