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
A$R_C = R_D$
B$R_B > R_A$
C$R_C > R_B$
D
None of these
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D
None of these
d 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 ${R_A} > {R_B} > {R_C} > {R_D}$
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