Describe clearly an experiment in which you could determine the
resistivity of a material. The materials include
ammeters, voltmeters, batteries, connecting wires, and multiple
pieces of wire made of the unknown material, each with different
length and cross-sectional area, electronic balance, diffraction
grating, a ruler, a caliper and an air track. The resistivity must
be obtained as the slope of a graph. What quantities should be
plotted along the axes?