Your friend is redoing the electronics in his car and using pure copper wires. U

Question

Your friend is redoing the electronics in his car and using pure copper wires. Unfortunately, his wiring job has resulted in too little electrical resistance, and the electronics are no longer functioning properly. Which of the following options would increase that electrical resistance the most? Replacing the original copper wires with copper-nickel alloy wires that have three times the resistivity and are twice as thick (meaning they have twice the radius). Replacing the original copper wires with a different set of pure copper wires that are half as thin (meaning they have half the radius) Replacing the original copper wires with a different set of pure copper wires that are three times as long and are twice as thick (meaning they have twice the radius). Tripling the lengths of the original copper wires.

Explanation / Answer

Resistance Ro = rho L/A

a. Rnew = 3* rhoL/4 A = 3/4 times of Ro

b. Rnew = 1/4 times of Ro

C. Rnew = 3 rho L/4 A   = 3/4 times of Ro

D. Rnew = 3 rhoL/A = 3 times of Ro

so option D suits the best

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