JEE Main & Advanced JEE Main Solved Paper-2016

  • question_answer
    An arc lamp requires a direct current of 10A at 80V to function. If it is connected to a 220V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to :- [JEE Main Solved Paper-2016 ]

    A) 0.065 H                

    B) 80 H

    C) 0.08 H                   

    D) 0.044 H

    Correct Answer: A

    Solution :

                    I = 10A V = 80v \[R=8\Omega \] \[10=\frac{220}{\sqrt{{{8}^{2}}+X_{L}^{2}}}\] \[{{X}_{L}}^{2}+64=484\] \[{{X}_{L}}=\sqrt{420}\] \[2\pi \times 50L=\sqrt{420}\] \[L=\frac{\sqrt{420}}{100\pi }\]                  \[\]


You need to login to perform this action.
You will be redirected in 3 sec spinner