12th Class Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Case Based (MCQs) - Current Electricity

  • question_answer
    A constant current / is flowing along the length of a conductor of variable cross-section as shown in the figure. The quantity which does not depend upon the area of cross-section is

    A) electron density              

    B) current density       

    C) drift velocity           

    D) electric field                    

    Correct Answer: A

    Solution :

    (a) electron density                                   When a constant current is flowing through a conductor of non-uniform cross-section, electron density does not depend upon the area of cross-section, while current density, drift velocity and electric field all vary inversely with area of cross-section.


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