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VMMC VMMC Medical Solved Paper-2008

  • question_answer
    Four wires each of same length, diameter and material are connected to each other to form a square. If the resistance of each wire is R, then equivalent resistance across the opposite comers is

    A)  R           

    B)                                         R/2                                       

    C)         R/4                                       

    D)         None of these

    Correct Answer: A

    Solution :

    The resistance of two arms on the opposite comers of a square = R + R = 2R. Therefore, for equivalent resistance between two opposite comers of a square, we have two resistance each of value 2R in parallel. So, \[\frac{1}{R}=\frac{1}{2R}+\frac{1}{2R}\] \[\frac{1}{R}=\frac{1+1}{2R}=\frac{2}{2R}\] \[R=R\]


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