11 分鐘

Cheap Astronomy - Fantastic Physics Formulas #5: The Maxwell-Faraday Equation & Ohm’s Law The 365 Days of Astronomy, the daily podcast of the International Year of Astronomy 2009

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Read by Duranee and Barry Haworth, written by Steve Nerlich, technical advice from Stephen D'Souza.
As usual, we’ll start by saying what the formula states – and then we’ll try and explain what the heck it all means. So, Maxwell-Faraday equation states how an electric current, or more specifically the electromotive force that drives an electrical current, can be induced by an adjacent magnetic field that changes with time. But, literally, and even more inscrutably, what the formula really states is that the curl of an electric field represented by an upside-down triangle multiplied by E is in the opposite direction to the change in magnetic flux over time – which is represented by a minus sign in front of dB over dt.
 
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Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
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Do go visit http://astrogear.spreadshirt.com/ for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
The 365 Days of Astronomy Podcast is produced by Astrosphere New Media. http://www.astrosphere.org/
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

Read by Duranee and Barry Haworth, written by Steve Nerlich, technical advice from Stephen D'Souza.
As usual, we’ll start by saying what the formula states – and then we’ll try and explain what the heck it all means. So, Maxwell-Faraday equation states how an electric current, or more specifically the electromotive force that drives an electrical current, can be induced by an adjacent magnetic field that changes with time. But, literally, and even more inscrutably, what the formula really states is that the curl of an electric field represented by an upside-down triangle multiplied by E is in the opposite direction to the change in magnetic flux over time – which is represented by a minus sign in front of dB over dt.
 
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!
Share the podcast with your friends and send the Patreon link to them too!
Every bit helps! Thank you!
------------------------------------
Do go visit http://astrogear.spreadshirt.com/ for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!
http://cosmoquest.org/Donate This show is made possible through your donations.
Thank you! (Haven't donated? It's not too late! Just click!)
The 365 Days of Astronomy Podcast is produced by Astrosphere New Media. http://www.astrosphere.org/
Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

11 分鐘

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