The figure shows the current I against the voltage V for three conductors P, Q and R. M is a point on curve Q, and the dashed line is the tangent at M. Statement I: If Q is a tungsten filament, its resistance at M equals the reciprocal of the slope of the tangent at M. Statement II: Curve R can be that of a semiconductor sample that warms up as the current in it rises.

Fig. 1: A graph with the voltage V on the horizontal axis and the current I on the vertical axis, both starting at zero, with no numbers on the axes. Three curves start at the origin. Curve P is a straight line rising steadily. Curve Q rises at first, then bends over so that it climbs more and more slowly. Curve R is bent the other way and climbs more and more steeply. A point M is marked on curve Q, with a dashed straight line touching the curve at M.