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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Mock Test - Current Electricity

  • question_answer
    The n rows each containing m cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of\[3\Omega \] resistance. If the total number of cells used are 24 and internal resistance of each cell is 0.5 \[\Omega \] then

    A) \[m=8,\,n=3\]   

    B) \[m=6,\,n=4\]

    C) \[m=12,\,n=2\] 

    D) \[m=2,\,n=12\]

    Correct Answer: C

    Solution :

    [c] Total cells \[=m\times n=24\]             ... (i) For maximum current in the circuit \[R=\frac{mr}{n}\] \[\Rightarrow 3=\frac{m}{n}\times (0.5)\Rightarrow m=6n\]                        ... (ii) On solving Eqs. (i) And (ii), we get \[m=12,n=2\]


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