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NEET Sample Paper NEET Sample Test Paper-46

  • question_answer
    If the potential difference across the internal resistance \[{{r}_{1}}\] is equal to the e.m.f. E of the battery, then -

    A) \[R\text{ }=\text{ }{{r}_{1}}+{{r}_{2}}\]

    B)                    \[R\text{ }=\text{ }{{r}_{1}}/{{r}_{2}}\]

    C)                    \[R\text{ }=\text{ }{{r}_{1}}-{{r}_{2}}~\]

    D)                    \[R\text{ }=\text{ }{{r}_{2}}/{{r}_{1}}\]

    Correct Answer: C

    Solution :

    \[I\,\,=\,\,\frac{E+E}{{{r}_{1}}+{{r}_{2}}+R}\,\,=\,\,\frac{2E}{{{r}_{1}}+{{r}_{2}}+R}\] \[V=E-I{{r}_{1}}=0\,\,\,\Rightarrow \,\,E=I{{r}_{1}}\]


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