Re: [DIYbio] Re: diy magnetic plate for DNA purification?

On 03/29/2018 02:41 PM, Nathan McCorkle wrote:
> I thought field strength was proportional to current, independent of how thick the wire is (or what the metal was). (sure thinner
> wire will get hotter faster, and may break... but that's another concern I think)

On 03/29/2018 02:53 PM, Skyler Gordon wrote:
> The current will play a factor, but so will the number of copper coils
Right, it's proportional to current X number of coils.

There's going to be a happy medium for a given field strength, and it probably would take
some testing to find it for an array of holes. When you make many loops in a tight space,
you end up with thin wire, and at some point the resistance decreases current flowing.

Copper wire is very consistent and for any diameter wire it is an easy calc to figure resistance per length.

So this is yet another thing that could be designed by spreadsheet.
Assembling loops of fine wire in tight rows then protecting them from damage in use
could be more expensive than buying Nd magnets... Spreadsheet sizings and price research work will tell. :-;

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