Alternating Current: Practice Problem & Solution
42. Two cables of copper are of equal lengths. One of them has a single wire of area of cross-section A, while other has 10 wires of cross-sectional area A/10 each. Give their suitability for transporting A.C. and D.C (1994)
Solution Explained:
To solve this problem, we apply the core principles of Alternating Current. Understanding the underlying formula is key to arriving at the correct answer below:
Alternating current (A.C.) exhibits the skin effect, concentrating on the conductor's surface.
Multiple stranded wires have a larger effective surface area, reducing resistance for A.C.
Direct current (D.C.) flows uniformly across the entire cross-section.
Thus, multiple strands are suitable for A.C., and either can be used for D.C.
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