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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
    A cell of internal resistance 3 ohm and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm.  The potential gradient in the wire is      [MP PET 2003]

    A)         30 mV/cm

    B)                        10 mV/cm

    C)         20 mV/cm                      

    D)         4 mV/cm

    Correct Answer: B

    Solution :

                                             Potential gradient =  \[\frac{e.R}{(R+r).L}\]= \[\frac{10\times 3}{(3+3)\times 5}\]. \[=1V/m=10\,mV/cm.\]


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