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(D) The phenomenon known as the $Skin 	ext{ } Effect$ causes the majority of $A.C.$ current to flow near the surface of a conductor.For $A.C.$ transm

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Only multiple strands for $A.C.$, either for $D.C.$

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(D) The phenomenon known as the $Skin 	ext{ } Effect$ causes the majority of $A.C.$ current to flow near the surface of a conductor.For $A.C.$ transmission, using a single thick wire is inefficient because the interior of the wire carries very little current.By using multiple thin strands, the total surface area is increased, which reduces the effective resistance for $A.C.$ and improves efficiency.For $D.C.$ transmission, the current is distributed uniformly throughout the cross-section of the conductor, so either a single thick wire or multiple thin strands will function effectively.Therefore, multiple strands are preferred for $A.C.$, while either type is suitable for $D.C.$

Two cables of copper are of equal lengths. One of them has a single wire of area of cross-section $A$, while the other has $10$ wires of cross-sectional area $A / 10$ each. Determine their suitability for transporting $A.C.$ and $D.C.$

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