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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    An external resistance R is connected to a cell of internal resistance r. The largest amount of current flows in the external resistance, when

    A)  \[R<r\]                                

    B)  \[R>r\]

    C)  \[R=r\]            

    D)                         Any other value of R  

    Correct Answer: D

    Solution :

     For current in the external circuit to be maximum, total resistance \[(r+R)\] should be minimum. \[r\]is a constant for a cell, so R should be zero. This value of \[R\] is not mentioned explicitly in any of the given options. Therefore, the correct option must be [d].


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