Field intensity is exponentially related to frequency and level. Line freq is too low to radiate all that far and JD said it was a low voltage (100's of volts) line so it wouldn't be electrostatics, would have to be current induced inductive coupling, aka electromagnetics.
V (induced, volts) = L (Inductance in Henries) di/dt (rate of change of current influx/period of change, in amp-seconds. Course since the plates are adjacent, the average value of ac electromagnetic coupling attempting to excite the plates and induce a charge change (aka deplete the charge on the cells) is zero so there would be a zero chance of inductive pickup with the plates as I see it. Assuming that coupling was occurring, one half cycle would discharge the plates to a degree and the other half cycle, opposite in phase would charge them back up....net effect = zero change.
I can dig out my McGraw Hill EE handbook and get the field intensity equation but I think it would be a waste of time. Little to no inductance in a thin, flat, plate.....no L no energy transfer, Wl being ½ L I (exp.2) and no L on a flat plate and average value of I is 0.
Tossing my hat on answering the concrete thing, you aren't going to discharge 12v in solution through a heavy duty rubber or plastic housing unless it's impregnated with something like lead that has fair conductivity along with the poor concrete conductivity. I was fed that same wives tale when I was young also. I think the tale is more oriented around sulphate doing the dirty work, piling up on the bottom of the case and shorting out the plates. Gotta have a mechanism for something to happen. I don't see one here.
My brain just slapped me with this: Steel battery trays are much higher conductivity than concrete. If leakage through the case were the culprit and there was a mechanism in that concrete shorted out the cells through the case, tell me why you can take the same battery and put it in a vehicle on a steel shelf, painted, rusted, or not and it not discharge?
That's the way I see it. Been away from stuff like this since 2005. Things have gotten a tad rusty.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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