It's been a while since school and I don't remember the right laws and formulas. So I come here. :)
I've got a power cord extender running from the wall outlet to my washing machine. It's about 3 or 4 meters in length. The outlet supplies 220V, but no grounding. The extender however does have grounding support, as does the washing machine. This means that the extender has three wires in it, and the grounding wire terminates at the outlet.
When plug in one end of the outlet, and measure the AC voltage between the grounding (disconnected) and zero wires, it gives me about 60V. Which happens to be unpleasant enough when accidentally touching the washing machine (even when it's turned off). Considering that the cable is so short, can this really be explained by induction?
To rule out a few other theories: the wall outlet does not connect anything to the grounding wire, it really does terminate there. The grounding wire does not touch any of the other wires, the resistance between it and other wires is infinity (or rather, beyond the range of my cheap multimeter).