If the pipe runs north/south, the mag field is east/west, and the
electric current is up/down.  I am too many years out of school to do
the vector math, but I know it works.

Think of an electric motor with a radial mag field, armature wires
parallel to the axis, and and circular motion.

Sherpa Doug

> -----Original Message-----
> From: Sean H. Breheny [mailto:shb7@CORNELL.EDU]
> Sent: Friday, October 12, 2001 1:50 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: "no variance, no induced currents" (was:
> Effects of a
> magnet on a PIC ?)
>
>
> Hi Doug,
>
> At 10:28 AM 10/12/01 -0400, you wrote:
> >One is for pumping liquid solder in wave solder machines.
> If you have a
> >pipe filled with liquid solder and you put a magnetic field crosswise
> >through the pipe and an electric current vertically through
> the pipe it
> >pumps solder through the pipe.  There are no moving parts except the
> >solder so maintenance is easy.  I have heard of something similar for
> >pumping liquid sodium in nuclear reactors.
>
> I haven't heard of this and it sounds really clever, but
> something doesn't
> seem right. Are you sure that the current is along the length
> of the pipe?
> The Lorentz force law says F=v cross B, so F has to be
> perpendicular to
> both velocity and B field. Velocity is parallel to electric
> current flow,
> so I don't see how it could be causing a force along the direction of
> electric current flow.
>
> Sean
>
>
>
>
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