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JEE Main & Advanced JEE Main Paper (Held On 9 April 2014)

  • question_answer
    A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f. 200 V through a resistance of \[1\Omega .\] The battery terminals are connected to an external resistance ?R?. The minimum value of 'R', so that a current passes through the battery to charge it is:   [JEE Main Online Paper ( Held On 09 Apirl  2014  )

    A) \[7\Omega \]                                    

    B) \[9\Omega \]

    C) \[11\Omega \]                                 

    D) Zero

    Correct Answer: C

    Solution :

    Given, emf of cell E = 200 V Internal resistance of cells \[=1\Omega \] D. C. main supply voltage V = 220 V External resistance R = ?\[r=\left( \frac{E-V}{V} \right)R\] \[1=\left( \frac{20}{220} \right)\times R\]\[\therefore \]\[R=11\Omega .\]


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