Question

The voltage current variation of two metallic wires X and Y at constant temperature are a shown in the figure. Assuming that the wires have the same length and the same diameter explain which of two wires will have larger resistivity.

Answer 1

In the given diagram we find that the slope of graph of X is more than the slope of graph of Y. It means that conductance of X is more than that or Y. In other words resistane of Y is more than that of X. So for same value of l and diameter (i.e. area of cross-section A), wire Y will have larger resistivity.