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<title>Why does copper pipe slows the falling magnet and not accelerate it? |
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<h1>Notopygos</h1> |
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<h2>Why does the copper pipe slows the falling magnet and not accelerate |
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it?</h2> |
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<p id="cyan">Published on: 26 Jun 2019 · Tags: <a |
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href="../tags/physics.html">physics</a></p> |
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<p>If you haven't already watched <a |
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href="https://www.invidio.us/watch?v=NqdOyxJZj0U">"World's First |
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Electric Generator - Veritasium"</a>, you should watch it. When we let a |
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magnet fall through a copper pipe, it is slowed down by the induced |
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electric current which creates a magnetic field that resists the |
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movement of the magnet.</p> |
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<p>The magnet's magnetic field can induce current in the pipe in two |
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directions, one is that which will accelerate it and the other which |
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will slow it down. According to <a |
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href="https://en.wikipedia.org/wiki/Lenz%27s_law">Lenz's Law</a>, |
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<em>the direction of the current induced in a conductor by a changing |
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magnetic field is such that the magnetic field created by the induced |
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current opposes the initial changing magnetic field.</em></p> |
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<h3>Why is the converse false?</h3> |
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<p><b>Assumption</b>: <em><a |
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href="https://en.wikipedia.org/wiki/Conservation_of_energy">Law of |
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Conservation of energy</a></em> is true</p> |
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<p>Let's say that the induced current is in the direction that will |
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accelerate the falling magnet. That breaks the Law of Conservation of |
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energy! We just made a free energy generator that makes energy out of |
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nowhere.</p> |
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<h4>How?</h4> |
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<p>Rotate the pipe and make it horizontal and now remove the earth from |
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below, or just ignore the earth's gravity. Take the magnet and push it |
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inside the copper pipe and it shall go on forever. When we push the |
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magnet we are changing the number of field lines that pass through it |
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which induces current in the pipe and now according to our assumption |
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in previous paragraph that the induced current will accelerate the |
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magnet, the magnet should never stop and should go on forever but we |
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only put a finite amount of energy in the system and it should stop |
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after a while if the Law of Conservation of energy is true.</p> |
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<h4>There is nothing to stop it and so it won't stop, how does this |
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break the Law of Conservation of energy?</h4> |
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<p>Yes it should not stop if there is nothing to stop it but it should |
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not accelerate either. In this case it's getting accelerated, where is |
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that extra energy coming from?</p> |
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<p>This proves why the copper pipe slows the falling magnet and not |
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accelerate it. Lenz's Law hold true in every case, the conducting metal |
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will want the number of magnetic field lines that pass through it to not |
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change and remain the same.</p> |
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|
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<h3>An Interesting Application: Electric brakes</h3> |
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<p>We can attach metal drums to car wheels and cover it around with |
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powerful electromagnets and when we turn on the electromagnet and it |
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will stop the car. The number of field lines that pass through the metal |
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drum will change because it's rotating and they don't want that change |
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but the electromagnet is fixed so it will have to stop itself.</p> |
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<p id="cyan">Published on: 26 Jun 2019 · Tags: <a |
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href="../tags/physics.html">physics</a></p> |
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<meta charset="utf-8"> |
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<title>Tag: mathematics</title> |
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<meta name="viewport" content="width=device-width, initial-scale=1.0"> |
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<meta name="description" content="Notopygos is a randomly chosen word from |
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some wikipedia page, I like the idea of using pseudonym on the internet."> |
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</head> |
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<body> |
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<div class="sidebar"> |
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<div class="sidebar-top"> |
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<h1>Notopygos</h1> |
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<p id="smallText">Notopygos is a randomly chosen word from some |
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wikipedia page</p><hr> |
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<a id="smallerText" href="index.html">Home</a> · |
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<a id="smallerText" href="mailto:notopygos@disroot.org">E-Mail</a> · |
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<a id="smallerText" |
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href="https://creativecommons.org/publicdomain/zero/1.0/">License</a> |
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<h2>Tag: mathematics</h2> |
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<th id="tableTitle">Title</th> |
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<th id="tableTitle">Published on</th> |
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</tr> |
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<tr> |
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<th id="smallText"><a href="../blog/the-difference-of-consecutive-x^n-is-always-an-odd-number.html"> |
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The difference of consecutive x^n is always an odd number</th> |
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<th id="smallText">21 Jun 2019</th> |
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</tr> |
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</table> |
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<meta charset="utf-8"> |
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<title>Tag: physics</title> |
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<meta name="viewport" content="width=device-width, initial-scale=1.0"> |
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<meta name="description" content="Notopygos is a randomly chosen word from |
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some wikipedia page, I like the idea of using pseudonym on the internet."> |
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<link href="../notopygos.css" rel="stylesheet" type="text/css"> |
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</head> |
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<body> |
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<div class="sidebar"> |
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<div class="sidebar-top"> |
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<h1>Notopygos</h1> |
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<p id="smallText">Notopygos is a randomly chosen word from some |
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wikipedia page</p><hr> |
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<a id="smallerText" href="index.html">Home</a> · |
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<a id="smallerText" href="mailto:notopygos@disroot.org">E-Mail</a> · |
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<a id="smallerText" |
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href="https://creativecommons.org/publicdomain/zero/1.0/">License</a> |
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</div> |
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<h2>Tag: physics</h2> |
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<th id="tableTitle">Title</th> |
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<th id="tableTitle">Published on</th> |
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</tr> |
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<tr> |
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<th id="smallText"><a href="../blog/why-does-the-copper-pipe-slows-the-falling-magnet-and-not-accelerate-it.html"> |
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Why does the copper pipe slows the falling magnet and not |
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accelerate it?</th> |
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<th id="smallText">26 Jun 2019</th> |
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