Due to skin effect

• A. Portion of the conductor near the surface carries more current and the core of the conductor carries less current
• B. Current flows through the half cross section of the conductor
• C. Uniform current flows through the conductor
• D. Portion of the conductor near the surface carries less current and the core of the conductor carries more current

Answer: (A)

Skin Effect:
tendency of the current to crowd near the conductor surface.

Skin effect is proportional to frequency, conductor diameter and permiability.
Skin effect increases effective resistance of conductor.
In DC, no skin effect.