Does spring around cable affects the current flow ?

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https://youtube.com/watch?v=VCIo8xGTUX0

Guys, recently I came across a video about securing the lifespan of Iphone chargers with spring coiled around it.

Question is, does the magnetic field affect the current flow in the cable ? Because I have tried it out, and it charges my Iphone 5S relatively slow than usual.