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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Kirchhoff's Law, Cells

  • question_answer
    100 cells each of e.m.f. 5 V and internal resistance 1 ohm are to be arranged so as to produce maximum current in a 25 ohms resistance. Each row is to contain equal number of cells. The number of rows should be              [MP PMT 1997]

    A)                    2

    B)                                      4

    C)                    5                                        

    D)            10

    Correct Answer: A

    Solution :

               If m = Number of rows and n = Number of cells in a row Then m ´ n = 100                                             .....(i) Also condition of maximum current is \[R=\frac{nr}{m}\] Þ \[25=\frac{1\times n}{m}\] Þ n = 25 m                       .....(ii) On solving (i) and (ii) m = 2


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