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MathGroup Archive 2005

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Re: Magnetic Pendulum

  • To: mathgroup at smc.vnet.net
  • Subject: [mg62259] Re: Magnetic Pendulum
  • From: "Kevin J. McCann" <kmccann at umbc.edu>
  • Date: Thu, 17 Nov 2005 17:03:53 -0500 (EST)
  • Organization: University of Maryland, Baltimore County
  • References: <200511160728.CAA08482@smc.vnet.net> <dlhhv1$5hj$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

You should note that the first site, which actually shows a calculation, 
is not actually doing a magnetic pendulum. The force law quoted is that 
for an electrostatic pendulum. The magnetic force in the problem is a 
dipole-dipole interaction, and that is not used on the website.

Kevin


Igor Antonio wrote:

> Nice way of saying "don't ask us to do your homework for you," David. :-)
> 
> Martin, show us your attempt at trying to do it and where you're having problems 
> and then the newsgroup can help.
> 
> Igor
> 
> David Park wrote:
> 
>>Martin,
>>
>>Just start a Mathematica Notebook. Use Sections to organize your work.
>>
>>Perhaps you will make a Statement of Problem section where you will define
>>your equations, parameters and initial conditions.
>>
>>Then make a Solution Section where you will try to solve the equations using
>>NDSolve. Once you get your solutions you can try to plot them.
>>
>>Maybe you will have additional Sections treating specific cases or classes
>>of cases. Maybe you will want to check simplified cases where the solution
>>reduces to an ordinary small oscillation pendulum.
>>
>>You will probably have to use trial and error to get to a useful point. If
>>you have real trouble at some point, say with the differential equations and
>>how to feed them into NDSolve, post the equations and your attempt to this
>>group. There are many people here, not me, who know a lot about differential
>>equations and will probably give you good help. Post the code by converting
>>the cell to InputForm and then copying and pasting into a posting.
>>
>>David Park
>>djmp at earthlink.net
>>http://home.earthlink.net/~djmp/
>>
>>
>>rom: Martin Koschi [mailto:martin.koschi at gmx.net]
>>
>>Hello, I have some questions.
>>Does somebody have the magneticpendulum problem solved as a mathematica
>>notebook, which he can send me?
>>
>>If not can somebody explain my how i can solve that problem? I have to
>>simulate a magnetic pendulum in mathematica.
>>
>>thx a lot
>>
> 
> 
> 


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