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BCECE Medical BCECE Medical Solved Papers-2014

  • question_answer
    As shown in the experimental setup, two cells with the same emf E and different internal resistance \[{{r}_{1}}\] and \[{{r}_{2}}\] are connected in series to an external resistance R Value of R so that the potential difference across the first cell be zero; is

    A)  \[{{r}_{1}}+{{r}_{2}}\] 

    B)  \[\frac{{{r}_{1}}}{{{r}_{2}}}\]      

    C)   \[{{r}_{1}}-{{r}_{2}}\]

    D)  \[{{r}_{1}}\,\,{{r}_{2}}\]

    Correct Answer: C

    Solution :

    \[i=\frac{2E}{R+{{r}_{1}}+{{r}_{2}}}\] \[i{{r}_{2}}+iR=E\] \[2{{r}_{2}}+2R=R+{{r}_{1}}+{{r}_{2}}\] or \[R={{r}_{1}}-{{r}_{2}}\]


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