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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2005

  • question_answer
    The current in a simple series circuit is 5.0 amp. When an additional resistance of 2.0 ohms is inserted, the current drops to 4.0 amp. The original resistance of the circuit in ohms was:

    A)  1.25

    B)  8

    C)  10

    D)  20

    Correct Answer: B

    Solution :

    Let the original resistance is \[R\Omega .\] \[\therefore \]\[V=IR\] \[V=5\times R=5R\] ...(i) When \[2\Omega \]resistance is inserted, then total resistance \[=(R+2)\Omega \] \[\therefore \] \[V=I(R+2)=4(R+2)\] ...(ii) From Eqs. (i) and (ii), we get \[5R=4(R+2)\] \[\therefore \] \[R=8\Omega \]


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