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.

Question

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. (A) only multiple strands for A.C., either for D.C. (B) only multiple strands for A.C., only single strand for D.C. (C) only single strand for D.C., either for A.C. (D) only single strand for A.C., either for D.C.

Tardigrade Admin · Accepted Answer

The major portion of the A.C. flows on the
surface of the wire. So where a thick wire is required,
a number of thin wires are joined together to give
an equivalent effect of a thick wire. Therefore
multiple strands are suitable for transporting A.C.
Similarly multiple strands can also be used for D.C.

Q. 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.

only multiple strands for A.C., either for D.C.

only multiple strands for A.C., only single strand for D.C.

only single strand for D.C., either for A.C.

only single strand for A.C., either for D.C.