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3. current electricity — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics3. current electricity1 Mark
MCQ
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
    $R_C > R_B$
  • ✓
    None of these
✓

Answer

Correct option: 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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