I just finished rearranging furniture in my room and I ended up with a lot of cables next to each other, some of them powering electronics that draw a few hundred watts. Is it any risky - for example, can I create a coil this way? I am aware that this way I can probably cause some powerful interference.
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You're quite likely fine. Here are the problems that could occur due to cables running close together, and why they won't for you.
Figure 1. An inductive coil. Figure 2. Cancellation.
Unless you wired your equipment with single wires it would be impossible to create a coil of the type shown in Figure 1.
Because your cables contain the feed and return current in very close proximity the inductance caused by the current to the load is exactly cancelled out by the current returning from the load.
Note that cables coiled up tightly are a different problem. If they are carrying significant current (for the gauge of wire) they will get warm or hot. This may cause insulation breakdown or even fire.
Interference in this situation would only be caused if your power cables ran beside signal level audio cables such as microphones or phono leads. If you can't hear it in your loudspeakers then all is well.
You will hardly create an inductor, since in each cable the current flows in both directions, making magnetic flux zero.
So, don't worry.