NEET Sample Paper NEET Sample Test Paper-50

  • question_answer In a potentiometer experiment two cells of emf \[{{E}_{1}}and\text{ }{{E}_{2}}\] are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of \[{{E}_{2}}\] is reversed, then the balancing length becomes 29 cm. The ratio \[{{E}_{1}}/{{E}_{2}}\] of the emfs of the two cells is-

    A) 1 : 1                 

    B) 2 : 1

    C) 3 : 1                             

    D) 4 : 1

    Correct Answer: C

    Solution :

    \[{{E}_{1}}+{{E}_{2}}=k{{\ell }_{1}}\] \[{{E}_{1}}-{{E}_{2}}=k{{\ell }_{2}}\]

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