JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Critical Thinking

  • question_answer
    A current of 1.5 A flows through a copper voltameter. The thickness of copper deposited on the electrode surface of area \[50\,c{{m}^{2}}\] in 20 minutes will be (Density of copper = 9000 \[kg/{{m}^{3}}\] and E.C.E. of copper = 0.00033 g/C)

    A)            \[2.6\times {{10}^{-5}}m\]     

    B)            \[2.6\times {{10}^{-4}}m\]

    C)            \[1.3\times {{10}^{-5}}m\]     

    D)            \[1.3\times {{10}^{-4}}m\]

    Correct Answer: C

    Solution :

                       Mass deposited \[m=\text{Density}\times \text{Volume}\,\,\text{of}\,\,\text{the}\,\,\text{metal}\]                    Þ \[m=\rho \times Ax\]. Also \[m=Zit,\] so \[Zit=\rho Ax\]  Þ \[x=\frac{Zi\,t}{A\rho }\]\[=\frac{0.00033\times {{10}^{-3}}\times 1.5\times 20\times 60}{(50\times {{10}^{-4}})\times 9000}=1.3\times {{10}^{-5}}\,m\]


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