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12th Class Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank MCQ - Current Electricity

  • question_answer
                         Three identical cells, each of 4V and internal resistance r, are connected in series to a \[6\,\Omega \] resistor. If the current flowing in the circuit is 2 (A) The internal resistance of each cell is:

    A) \[0.11\,\Omega \]                  

    B) \[0.\,\Omega \]

    C) \[0.12\,\Omega \]                 

    D) \[1.1\,\Omega \]

    Correct Answer: B

    Solution :

    (b) \[0\,\Omega \] Total emf \[=3\times 4=12\text{ }V\] Total resistance \[=6+3r\] Current in the circuit \[=2\text{ }A\] Using ohms law,             \[2=\frac{12}{(6+3r)}\] \[2(6+3r)=12\]             \[12+6r=12\]             \[6r=12-12=0\]             \[r=\frac{0}{6}=0\]


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