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Railways RRB (Assistant Loco Pilot & Technician) Solved Paper-2 (2013)

  • question_answer
    The emf of a primary cell is 2 V. When it is short-circuited, it gives a current of 4 A. Its internal resistance is

    A)  \[2.0\,\Omega \]                    

    B)  \[5.0\,\Omega \]

    C)  \[0.5\,\Omega \]                    

    D)  \[8.0\,\Omega \]

    Correct Answer: C

    Solution :

    \[l=\frac{E}{r+R}\] When short circuited, external resistance = 0 \[4=\frac{2}{r}\Rightarrow \,r=\frac{2}{4}=0.5\,\Omega \]


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