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

  • question_answer
    A battery having 12 V emf and internal resistance \[3\,\Omega \] is connected to a resistor. If the current in the circuit is 1 A, then the resistance of resistor and lost voltage of the battery when circuit is closed will be:

    A) \[7\text{ }\Omega \text{, }7\text{ }V\]               

    B) \[8\text{ }\Omega ,\,8\text{ }V\]

    C) \[9\text{ }\Omega ,\text{ }9\text{ }V\]              

    D) \[9\text{ }\Omega ,10\text{ }V\]

    Correct Answer: C

    Solution :

    (c) \[9\text{ }\Omega ,\text{ }9\text{ }V\] Here, \[\varepsilon =12\text{ }V,r=3\,\Omega ,\,l=1A,\,V=lR=\varepsilon -lr\] \[\therefore R=\frac{\varepsilon -lr}{l}=\frac{12-1\times 3}{1}\]             \[=12-3=9\,\Omega \] And      \[V=iR=1\times 9=9V\]


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