## 08-23 Stealing Charge from the Earth

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It turns out this actually another method to charge by induction.
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This method, just like the first method, also uses two spheres
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but here, one of those spheres is actually the earth.
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Let's say you have your conducting sphere and it's attached to the ground by a conducting rod.
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Let's also add a bunch of wires that extend into the ground
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and then let's hold a positive charge over our conducting sphere.
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What's going to happen is that we're going to actually draw electrons from the earth.
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If we then detached this sphere, we can even remove the positive charge
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and now here we have it, a negatively charged sphere.
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And this negative charges somehow came from the ground.
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Now, of course, this must mean that throughout the earth,
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there must be a few extra positive charges lingering around.
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They've lost their electrons.
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It seems like if we were to do this experiment over and over and over,
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well, eventually we'd have a positively charged earth and that might be a problem.
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It turns out that this is a non-issue and I want you to tell me
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why you think this works and why it's a non-issue?
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Maybe you think the earth is somehow able to create electrons
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create this negative charges, so that actually there's no residual positive charge leftover.
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Maybe it has something to do with the fact that the earth is huge.
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Maybe that has something to do with the reason why this never becomes a problem
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where we actually wind up charging the earth with some noticeable amount.
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Or maybe you think the earth is an insulator, something in which charges cannot move
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and that this somehow saves us and allows this whole process to work.
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Check what you think is the best answer.
Title:
08-23 Stealing Charge from the Earth
Team:
Udacity
Project:
PH100 - Intro to Physics
Duration:
01:26

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