45. You've been asked to determine whether a new material your company has made is ohmic and, if so, to measure its electrical conductivity. Taking a 0.50 mm x 1.0 mm x 45 mm sample, you wire the ends of the long axis to a power supply and then measure the current for several different potential differences. Your data are as follows:

Use an appropriate graph of the data to determine whether the material is ohmic and, if so, its conductivity.

Fig: 1

Fig: 2

Fig: 3