CET Karnataka Medical CET - Karnataka Medical Solved Paper-2006

  • question_answer
    A current of 6 A enters one comer P of an equilateral triangle PQR having 3 wires of resistances 2 0 each and leaves by the corner R. Then the current I1 and I2 are:

    A)  2 A, 4 A         

    B)  4 A, 2 A

    C)  I A, 2 A

    D)  2 A, 3 A

    Correct Answer: A

    Solution :

    From Kirchhoffs first law at junction P, \[{{I}_{1}}+{{I}_{2}}=6\] ...(i) From Kirchhoffs second law to the closed circuit PQRP, \[-2{{I}_{1}}-2{{I}_{1}}+2{{I}_{2}}=0\] \[\Rightarrow \] \[-4{{I}_{1}}+2{{I}_{2}}=0\] \[\Rightarrow \] \[2{{I}_{1}}-{{I}_{2}}=0\] ?(ii) Adding Eqs. (i) and (ii), we get \[3{{I}_{1}}=0\] \[\Rightarrow \] \[{{I}_{1}}=2A\] From Eq. (i), \[{{I}_{1}}=6-2=4A\]


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