NTNUJAVA Virtual Physics Laboratory
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Author Topic: A loop rotating in a magnetic field (How electric power generator works!  (Read 7346 times)
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ahmedelshfie
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on: April 12, 2010, 02:17:41 am » posted from:Uberaba,Minas Gerais,Brazil

This applet created by Prof Hwang
Modified by my self
I add tow bars for (sc) and (time)
Original project:A loop rotating in a magnetic field (How electric power generator works!)

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* loop.jpg (39.18 KB, 636x573 - viewed 411 times.)
« Last Edit: April 21, 2010, 12:07:55 pm by ahmedelshfie » Logged
ahmedelshfie
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Reply #1 on: April 21, 2010, 02:42:23 am » posted from:,,Brazil

When a loop rotating in a uniform magnetic field.
The magnetic flux is changing which will induce electric field along the loop (produce voltage).
If the loop is rotating with constant angular velocity \omega . (The angle is \omega t)
The magnetic flux in the loop will be \Psi =\int \vec{B}\cdot d\vec{A}= B A cos(\omega t)
So the induced emf = -\frac {d\Psi}{dt}=B A \omega sin(\omega t)

The following simulation show how it works dynamically.
« Last Edit: May 18, 2010, 07:52:55 am by ahmedelshfie » Logged
Fu-Kwun Hwang
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Reply #2 on: April 21, 2010, 10:06:44 am » posted from:Taipei,T'ai-pei,Taiwan

You need to add TeX equation between $ to be displayed as equation.
I have added dollar sign for the above posted message for you!
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ahmedelshfie
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Reply #3 on: April 21, 2010, 12:21:11 pm » posted from:Uberaba,Minas Gerais,Brazil

Yes prof,, i had the text information and equations from topic
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=912.0
So i think I'm make wrong right Huh
« Last Edit: April 22, 2010, 09:47:16 am by ahmedelshfie » Logged
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Reply #4 on: April 21, 2010, 04:50:40 pm » posted from:Taipei,T'ai-pei,Taiwan

You need to add dollar sign for those equations.
Otherwise, those equation would not be convert to image.

The following is what you have copied.
Code:
This simulation shows a current loop in uniform magnetic field.
The black arrows show the force due to magnetic field on the loop.
\vec{F}= q \vec{v} \times \vec{B} or \vec{F}= I \int d\vec{\ell} \times \vec{B}
The magnetic field in in the +Z direction if Bz>0.
Then ,torque for the loop is calculated from definition \vec{\tau}=\vec{r}\times\vec{F}

Because the current flow in the same counter-clockwise direction.
The force on the loop change sign during each helf cycle.
If we current reverse direction during each helf cycle, the following device can turn into a motor.
A voltage source is needed in the loop to drive the current.
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Reply #5 on: April 21, 2010, 10:51:46 pm » posted from:Uberaba,Minas Gerais,Brazil

I understand prof so when i would typing any equations i add $ between equations
For convert to picture right
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Reply #6 on: April 22, 2010, 02:48:25 pm » posted from:Taipei,T'ai-pei,Taiwan

Yes!  Cheesy
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ahmedelshfie
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Reply #7 on: April 22, 2010, 05:19:06 pm » posted from:,,Brazil

Yes prof  Smiley
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