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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Self Evaluation Test - Current Electricity

  • question_answer
    An electron beam has an aperture \[1.0m{{m}^{2}}.\] A total of \[6\times {{10}^{6}}\] electrons go through any perpendicular cross section per second. Find the current density in the beam. (in \[A/{{m}^{2}}\])

    A) \[9.1\times {{10}^{13}}\]

    B) \[9.6\times {{10}^{3}}\]

    C) \[6.6\times {{10}^{5}}\]

    D) \[8.6\times {{10}^{11}}\]

    Correct Answer: B

    Solution :

    [b] \[J=I/A=Q/tA={}^{ne}/{}_{tA}\] \[=9.6\times {{10}^{3}}A/{{m}^{2}}\]


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