The length of the cable will not affect the current running through it, when its just a few feet of difference. It is what the cable is capable of carrying that matters.
You wouldnt lose too much to notice with just a few feet of extension. Now if you were trying to run a miliamp of current across 100 miles of cable, then you probably would never get your phone charged.
For example, cables that are considered "critical length" are cables that carry RF (radio frequency), and its due to the amount of loss across the length of the cable. That's more "gee-whiz" information than anything really.
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