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 consists of a wire of length 4 m and resistance \[10\,\Omega \]. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be [CBSE PMT 1999; AFMC 2001]

    A)                                                      0.5 \[V/m\]                           

    B)            \[2\,V/m\]

    C)                    \[5\,V/m\]                    

    D)            \[10\,V/m\]

    Correct Answer: A

    Solution :

                 Since potential difference for full length of wire = 2 V            \ P.D. per unit length of wire\[=\frac{2}{4}=0.5\,\frac{V}{m}\]


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