Question

Which of the following is true for a multistranded wire?

• A. The increased surface area of multi-stranded wire decreases the amount of resistance.
• B. The increased surface area of multi-stranded wire increases the amount of resistance.
• C. The decreased surface area of the multi-stranded wire decreases the amount of resistance
• D. The decreased surface area of multi-stranded wire makes the amount of resistance almost nil.

Answer 1

The correct option is A

The increased surface area of multi-stranded wire decreases the amount of resistance.

The increased surface area (together) of the multi-stranded wire decreases the amount of resistance (the opposition to the flow of charges) that currents or signal passing through the wire will face. This results in less heating of a wire i.e. less energy loss. Instead of it if we take a thick metallic wire, and pass the current through it, it causes more energy losses through heating. For a conductor, if the resistance is more, current is less.