| ASSERTION: When n cells each of internal resistance r are arbitrary connected in series, the total internal resistance of cells may be zero. |
| REASON: The internal resistance depends on 'polarity of cell connected in circuit. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: D
Solution :
The total internal resistance is nr there is no effect of connection of cells in circuit on total internal resistance. Internal resistance depends only on nature and dimension of cell. It has same property as that of resistance. \[\Rightarrow r={{r}_{1}}+{{r}_{2}}\](connected in series) \[\Rightarrow \,\frac{1}{r}=\frac{1}{{{r}_{1}}}+\frac{1}{{{r}_{2}}}\](connected m parallel) (Irrespective of direction of current and voltage).
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