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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    In the equation AB = C, where A is current density, C is electric field. Then B is

    A)  resistivity  

    B)  conductivity

    C)  potential difference

    D)  resistance

    Correct Answer: A

    Solution :

                    \[B=\frac{C}{A}=\frac{E}{h}=\frac{E}{i/A}=\frac{EA}{i}=\frac{EA}{n\,\,e\,\,A\,\,{{v}_{d}}}\]                    \[=\frac{E}{n\,\,e\,\,(e\,\,E\,\,\tau /m)}=\frac{m}{n\,\,{{e}^{2}}\tau }=\rho \]


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