Inductance of a pair of circular wires is basically mu_0 * l/pi, with a prefactor that is logarithmic in the geometry. Logarithmic functions grow extremely slowly, so that factor can just be considered order 1. The magnetic constant is ~1.26 microhenry/meter. So 10 meters of cable of almost any kind will have an inductance roughly 4-10 microhenry depending on the conductor thickness and separation.
Energy stored in an inductor is 0.5 * LI^2. So if you are drawing 20 amps, the energy in a 5 uH inductor is about 1 *millijoule*. Utterly insignificant, and in the case that the wiring is disconnected, that energy will easily be absorbed by the tiniest input filter or supply capacitors. Whatever is causing the problems you are seeing, it is not caused by energy stored in 10 meter of mains wiring.
Many devices connected to the mains, such as relays, transformers, and inductors have much, much higher inductance, potentially several henries, or a million times higher than the inductance of your 10 meter cable.
You can run into a problem here. If your device has such a relay or transformer in it and you switch it off, you can generate a large surge as the energy stored in the coil has to go somewhere. You *can* just dissipate it into the mains, in which case the mains inductance does play a role in how effectively it can clamp that spike you generated. But really, that is just because your device is broken. It shouldn't dump surges of power back into the mains, it should use a snubber network to absorb that energy safely.