Question

Which of the following would decreasethe 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

Ohm's 2nd Law:

Resistance = ro (coefficient) x Length/Area

`R = ro * l / a`

Shortening the Conductor: Length decrease, Area become greater than Length, Ro is a constant, so it doesn't change. Result: The Resistance will be lower.

Answer: A.

Answer 2

A (shortening the conductor)
Since resistance = (resistivity × length) / cross sectional area, decreasing length decreases resistance