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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 potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)                    [AMU (Med.) 2000]

    A)         1                                        

    B)         2

    C)         5                                        

    D)         10

    Correct Answer: D

    Solution :

                                             \[V=xl\Rightarrow iR=xl\] \[\Rightarrow \,\,\,i\times 10=\left( \frac{2\times {{10}^{-3}}}{{{10}^{-2}}} \right)\times 50\times {{10}^{-2}}=0.1\] \[\Rightarrow \,\,\,\,i=10\times {{10}^{-3}}A=10\,mA\].


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