When the coils are close, the magentic field of each individual wrap has an affect on many neighboring individual wraps. When the coil is spread, the magetic field only affects the closest neighbors. See inductive choking.
this is a good question. I think the skin effect and proximity effects affect the area of the wire that can carry a current, which in principle does not depend on current. However, in reality, higher current means that there will be more heat generated, and so the temperature of the wire will increase, and resistance is temperature-dependent (usually higher resistance with higher temperature)
I did not know that proximity effect is so evil. That would explain, why some inductors perform so poorly even though the wire is smaller than the skin depth. Thank you!
Thank you for this simple but effective demonstration. I had been studying skin effect for coils I am making, but was puzzled why litz wire was specified with a much smaller area wires for a frequency than the skin area alone would suggest. I believe this must be due to minimizing the proximity effect.
Does anyone know if the Skin Effect and the Proximity Effect have any impact on the transmission of audio signals through wires in a home audio system, such as with audio cables that connect speakers to amplifiers or receivers, or with HDMI cables that connect various devices within the home audio system? If so, what would this impact be and is it one that someone would need to be concerned about?
