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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Different Measuring Instruments

  • question_answer
    In given figure, the potentiometer wire AB has a resistance of 5 W and length 10 m. The balancing length AM for the emf of 0.4 V is                                                              [Pb. PET 2001]

    A)         0.4 m

    B)         4 m

    C)         0.8 m

    D)         8 m

    Correct Answer: D

    Solution :

                                             \[E=\frac{e}{(R+{{R}_{h}}+r)}.\frac{R}{L}\times l\]Þ \[0.4=\frac{5}{(5+45+0)}\times \frac{5}{10}\times l\] Þ l = 8 m


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