Question

Which of the following would decrease the resistance to the flow of an electric current through a body?

A. Shortening the conductor
B. Lengthening the conductor
C. Using a conductor with a smaller cross section
D. Heating the conductor

Answer 1

On page 37 it explains that If two conductors are composed of the same material and have the same cross-sectional area but different lengths, the electrical resistance of the longer conductor will be greater than that of the shorter conductor.

So the correct answer is A. shortening the conductor

Answer 2

R = ρ L/A. R= resistance, ρ= resistivity, L= length of the conductor. A = area of the conductor. Resistance is directly proportional to the length of the conductor. So if length of the conductor is decreased, resistance will also decrease. Hence A is the correct option