Current versus- voltage plots for two materials, A and B, are shown in Figure 21-37. (a) Is

Question:

Current versus- voltage plots for two materials, A and B, are shown in Figure 21-37.

(a) Is the resistance of material A greater than, less than, or equal to the resistance of material B at the voltage V1?
(b) Choose the best explanation from among the following:
I. Curve B is higher in value than curve A.
II. A larger slope means a larger value of I/V, and hence a smaller value of R.
III. Curve B has the larger slope at the voltage V1 and hence the larger resistance?