Copper wire in sand & freshwater?

Copper wire in sand & freshwater?
I want to put a "copper transfomer" type of insulated wire 20AWG to
30AWG in sand with fresh water but do not know how much spacing I must
About 10 volt, 5 Amp, 60Hz...
How will I calculate the spacing needed?
Where can I find the of Permittivity of water & sand
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for what purpose? trying to make the worms come out?
spacing of what? the turns of a coil?
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