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Re: (way)(OT): Lorentz Force worked numerical example.

by zentara (Archbishop)
on Aug 01, 2008 at 16:24 UTC ( [id://701739]=note: print w/replies, xml ) Need Help??


in reply to (way)(OT): Lorentz Force worked numerical example.

From my old Physics, the first thing I thought of was Maxwell's Equations. I googled for "Maxwell Lorentz straight wire" and got alot of hits, like

Free Maxwell book with real solved problems See Chapter4 Problems for straight wire.

Maxwell Answers Search for Oersted on that page.

The big problem as I see it, is what are the assumptions made to simplify calculations. For instance, do you assume a uniform temperature always( affects resistance)? Another simplification would be assuming the wire has 0 radius, otherwise you need to account for different current flow at the skin versus the center. You might want to ask in the newsgroup sci.physics.

If you wanted some real world examples, I would also look at Electrical Engineering sites for examples of power line computations. I'm sure somewhere, some EE has a rule of thumb calculation for the Force on his power lines, especially at substations where short connections are made at high power. Maybe there is a Schaum's Outline Guide for Electrical Engineering, which contains simplified calculations and solutions for common problems?


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Re^2: (way)(OT): Lorentz Force worked numerical example.
by YYCseismic (Beadle) on Aug 01, 2008 at 16:37 UTC
    ...to account for different current flow at the skin versus the center.

    Ampere's Law tells us that current through a wire is confined to the "skin".

      Ok, then you need to decide whether you will do your computations from the skin surface, or assume the current is at the center of the conductor. A skin calculation will be quite abit more difficult. To be honest, the whole idea of trying to accurately compute these things from formulas, for the real world is mind-boggling, if not futile.

      I'll bet they use some sort of supercomputer simulation, to get formulas with fudge factor constants for different conditions and materials.


      I'm not really a human, but I play one on earth Remember How Lucky You Are

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