Two cables of copper are of equal lengths. One of them has a single wire of area of cross-section A,
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here is your answer
In case of alternating current (AC) magnetic field woulx often change and inducec current due to self induction would bring an hindrance. So as we have 10 strands then each would cancel the magnetic flux changing and so induced current is reduced to its maximum.
In case of dc no such induction as current is steady. Hence magnetic flux also remains steady.
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The real segment of the A.C. streams on the outside of the wire.
So where a thick wire is required, various meager wires are consolidated to give an identical impact of a thick wire.
Thusly different strands are appropriate for transporting A.C. Correspondingly different strands can likewise be utilized for D.C. this is is the correct answer to to the question.