[DIYbio] magnetic stirrer (was: Automated Cell Culturing)

On 07/07/2013 01:30 PM, Simon Quellen Field wrote:
> Has anyone on the list built their own magnetic stirrer yet?

no, but...

> A motor, a bar magnet glued to the axle, a couple batteries, and a non-ferrous metal enclosure to prevent the microwaves from
> cooking the batteries, and you are all done. Add a rheostat to control the speed.

What would the interaction of the bar magnet field and the microwaves be like? What I can find on resonances suggests
iron can move and have resonances much higher than the 2.4GHz of microwave oven, so they would interact, but what are the relative
strengths of fields? Does the 2.4GHz E & M field peak out higher than the bar magnet, or the other way around?
How much would the bar magnet field bend and rearrange the microwaves?

You could drill a hole in the metal box for the
> axle and glue the magnet on the outside of the metal box, then put a glass plate above it to hold the beaker to be stirred.

What would that get you vs. the bar magnet inside a brass can?

Supposing you have a strong magnet rotating under a beaker of water in a
microwave oven that's on for 30 seconds, will you get:

a. better diffuse heating by magnetically deflected microwaves.
b. A hot bar magnet.
c. all of the above.
d. none of the above.
e. a bar magnet with decreased permanent magnetism.

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