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MGIMS WARDHA MGIMS WARDHA Solved Paper-2009

  • question_answer
    A potentiometer has uniform potential gradient across it. Two cells connected in series to support each other and (ii) to oppose each other are balanced over 6m and 2m, respectively on the potentiometer wire. The emf s of the cells are in the ratio of

    A)  1: 2                                       

    B)  1 : 1

    C)  3 : 1                                      

    D)  2 : 1

    Correct Answer: D

    Solution :

                     \[{{E}_{1}}+{{E}_{2}}=k\times 6\]                                             ?..(i) \[{{E}_{1}}-{{E}_{2}}=k\times 2\]                                                     ...(ii) Solving Eqs. (i) and (ii), we get \[\frac{{{E}_{1}}}{{{E}_{2}}}=\frac{2}{1}\] \[\Rightarrow \]               \[{{E}_{1}}:{{E}_{2}}=2:1\]


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