JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Electric Conduction Ohms and Resistance

  • question_answer
    A potential difference of V is applied at the ends of a copper wire of length l and diameter d. On doubling only d, drift velocity                                                      [MP PET 1995]

    A)                    Becomes two times  

    B)            Becomes half

    C)                    Does not change        

    D)            Becomes one fourth

    Correct Answer: C

    Solution :

                 Drift velocity \[{{v}_{d}}=\frac{V}{\rho \,l\,n\,e};{{v}_{d}}\] does not depend upon diameter.


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