Variation of current passing through a conductor as the voltage applied across its ends as varied is shown in the adjoining diagram. If the resistance (R) is determined at the points A, B, C and D, we will find that 

(1) RC = RD

(2) RB > RA

(3) RC > RB

(4) None of these

(4) From the curve it is clear that slopes at points A, B, C, D have following order A > B > C > D.

And also resistance at any point equals to slope of the V-i curve.

So order of resistance at three points will be RA>RB>RC>RD

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