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"That their main business was not put into the mind knowledge which was not there before, but to turn the mind's eye towards light so that it might see for itself." ...Plato's advice to educators(429-347BC)

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 Author Topic: Current Loop in magnetic field (How motor works!)  (Read 4561 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
ahmedelshfie
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 « Embed this message on: June 08, 2010, 01:40:56 am » posted from:SAO PAULO,SAO PAULO,BRAZIL

This following applet is Current Loop in magnetic field (How motor works!)
Created by prof Hwang Modified by Ahmed
Original project Current Loop in magnetic field (How motor works!)

This simulation shows a current loop in uniform magnetic field.
The brown 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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Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!
 Current Loop in magnetic field (How motor works!).gif (16.21 KB, 536x581 - viewed 469 times.) « Last Edit: June 08, 2010, 01:42:54 am by ahmedelshfie » Logged
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"That their main business was not put into the mind knowledge which was not there before, but to turn the mind's eye towards light so that it might see for itself." ...Plato's advice to educators(429-347BC)
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