Name: Coulomb's Law | Electrostatics | Electrical engineering | Khan Academy
Uploaded: 2022-07-19T03:00:46.000Z
Duration: 11 min 50 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

- [Voiceover] So we've already started to

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familiarize ourselves with the notion of charge.

We've seen that if two things have the same charge,

these things are going to repel each other.

So if I have a positive and I have a negative

We've started to observe of how these different charges,

how these things start to interact with each other.

these two things are going to attract each other.

of attraction or repulsion is going to be

And this was a question people have noticed,

I guess what you could call electrostatics,

for a large swathe of recorded human history.

that people started to seriously view this

and even start to predict in a kind of serious,

And it wasn't until 1785, and there were many

is to predict what is going to be the force of

the electrostatic force of attraction or repulsion

And so in Coulomb's law, what it states is

so let me, let's say this charge right over here,

because it could be positive or negative,

but I'll just make it q one, it has some charge.

and then another charge q two right over here.

And then I have the distance between them being r.

So the distance between these two charges

which would tell us the direction of the force

the magnitude of the electrostatic force,

Coulomb stated, well this is going to be,

and he tested this, he didn't just kind of guess this.

People actually were assuming that it had something

and feel really good about stating this law.

Saying that the magnitude of the electrostatic force

to the product of the magnitudes of the charges.

So I could write this as q one times q two,

and I could take the absolute value of each,

taking the absolute value of the product.

Here's why I'm taking the absolute value of the product,

but we just want the overall magnitude of the force.

the absolute value of the product of the charges

not just to r, but to the square of the distance.

is how close it mirrors Newton's law of gravitation.

Newton's law of gravitation, we know that the force,

remember mass is just another property of matter,

that we sometimes feel is a little bit more tangible

because it feels like we can kind of see weight and volume,

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Coulomb's Law | Electrostatics | Electrical engineering | Khan Academy

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