Alright, so my understanding of earth potential rise might be

>>1210414
Sounds about right. I can't say how much current you would get from the exercise.

Yes. that's why you don't want to stand with your feet wide apart when a power line is down. How far would depend on the voltage, moisture content, and luck.

>>1210414
That's about right, its why when you run ground rods you have to connect them via a big copper cable.
>>1210427
And this, Powerlines or standing near antenna towers in a lightning storm is a no-no. The potential difference between your two feet on electrified ground can be a few hundred to a few thousand volts depending on soil conductivity. Current can flow up one leg and down the other which can kill you on the spot.

>>1210414
just like everything else earth has a resistance
if you are suggesting something like a grounding rod then you could measure the voltage drop of any earth leakage sure. it will be absolutely tiny.

if you have decent equipment it shouldn't be dumping anything into the earth connection. you might get some voltage induced via ac coupling.

typically new installations include a breaker designed to trip when current returns via earth during a fault rather than via neutral. i think for tt 100ma is typical, otherwise 30ma trip. thats the maximum kind of current you can expect to measure.

this is more verging into equipotential bonding territory than protective earthing...

>>1210414
https://en.m.wikipedia.org/wiki/Earth_battery

>>1210427
That's why they call it "step potential" anon.

I learned something new today