A student carries out an experiment to determine the resistivity of a metal wire. She determines the resistance from measurements of potential difference between the ends of the wire and the corresponding current. She measures the length of the wire with a ruler and the diameter of the wire using a micrometer. Each measurement is made with an uncertainty of 1% Which measurement gives the largest uncertainty in the calculated value of the resistivity?

Source: June 2018 · 8 · 2018