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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    The current flowing in the given circuit is 0.1A. The potential difference between the points x and y is

    A)  4.0 V                                    

    B)  3.0 V

    C)  2.5 V                                    

    D)  2.0 V

    Correct Answer: C

    Solution :

                    \[I=\frac{6-2}{20+5+R}\] \[I=\frac{4}{25+R}\] \[0.1=\frac{4}{25+R}\] \[40=25+R\] \[R=15\,\Omega \] The current of 0.1 A must flow from x to y through R \[{{V}_{x}}+6-(0.1)\,(15)-2-{{V}_{y}}=0\] \[{{V}_{x}}+6-1.5-2-{{V}_{y}}=0\] \[{{V}_{x}}-{{V}_{y}}=2.5\,V\]


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