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EAMCET Medical EAMCET Medical Solved Paper-2007

  • question_answer
    The current in a circuit containing a battery connected to 2\[\Omega \] resistance is 0.9 A. When a resistance of 7\[\Omega \] is connected to the same battery, the current observed in the circuit is 0.3 A. Then the internal resistance of the battery is

    A)  0.1\[\Omega \]                               

    B)  0.5\[\Omega \]

    C)  1\[\Omega \]                                   

    D)  zero

    Correct Answer: B

    Solution :

                     \[i=\frac{E}{R+r}\] or            \[\frac{{{i}_{1}}}{{{i}_{2}}}=\frac{{{R}_{2}}+r}{{{R}_{1}}+r}\] \[\therefore \]   \[\frac{0.9}{0.3}=\frac{7+r}{2+r}\] or  \[3=\frac{7+r}{2+r}\] or            \[r=0.5\,\Omega \]


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