Re: EMI and a hard drive
Under standard conditions of 1 atm, and 1 M worth of ions in solution.
Ag+ to Ag has a reduction potential of 0.799 volts.
Cu++ to Cu has a reduction potential of 0.337 volts.
Sn++ to Sn has a reduction potential of -0.14 volts.
If under standard conditions with Ag used, then 0.799 - 0.337 = 0.662 volts with the Ag as the cathod. Therefore, the Cu would dissolve and the Ag would plate if a reaction were to occur.
I think it is important to point out that you will almost certainly see little reaction unless you introduce a large amount of some electrolyte.
But maybe I am wrong.
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