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Answer Posted / dharmendra
Boss, Simple thing...!
R= ρ x L / A
For any conductor L can be any thing (1,10,50,500 Meters.....so on), row (ρ) resistivity will be constant for AL or CU.
Now this whole thing which is playing here is A, as its inverse proportional to R
at center A=0; R= ∞ at mid A= crossection area/2,; R will be double .
and at Surface A= cross section area, (means R will be minimum),
Current is also lazy as we engineers are, hence it will go through the path where R will be minimum, so it will flow over the outer most skill of CU or AL conductor,
This is called skin effect.
GOT IT MY FRINED.....!
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