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12th Class Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Case Based (MCQs) - Current Electricity

  • question_answer
    In a potentiometer experiment, the balancing length is 8 m, when the two cells \[{{E}_{1}}\] and \[{{E}_{2}}\] are joined in series. When the two cells are connected in opposition the balancing length is 4 m. The ratio of the e.m.f of two cells \[\left( {{E}_{1}}/{{E}_{2}} \right)\] is :

    A) 1 : 2

    B) 2 : 1

    C) 1 : 3

    D) 3 : 1

    Correct Answer: D

    Solution :

    \[\frac{{{E}_{1}}}{{{E}_{2}}}=\frac{{{l}_{1}}+{{l}_{2}}}{{{l}_{1}}-{{l}_{2}}}=\frac{8+4}{8-4}=\frac{12}{4}=\frac{3}{1}\]


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