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Punjab Medical Punjab - MET Solved Paper-2001

  • question_answer
    A \[50\,\,volt\] battery is connected across a 10 ohm resistor. The current is 4.5 amp. The internal resistance of battery will be

    A) \[5.0\,\,\Omega \]                         

    B) \[1.1\,\,\Omega \]

    C) \[0.5\,\,\Omega \]                         

    D) \[zero\].

    Correct Answer: B

    Solution :

    Using the relation                 \[i=\frac{E}{R+r}\] (given:\[E=50\,\,V,\]      \[R=10\Omega \] \[i=4.5\,\,amp\}\]                 \[4.5=\frac{50}{10+r}\]                 \[45+4.5r=50\]                 \[4.5r=50-45=5\] or            \[r=\frac{5}{4.5}=\frac{10}{9}=1.1\Omega \]


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