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DUMET Medical DUMET Medical Solved Paper-2005

  • question_answer
    If a current of 3 A flowing in the primary coil is reduced to zero in 0.01 s, then the induced emf in the secondary coil is 1500 V. The mutual inductance between the two coils is :

    A)  0.5 H           

    B)  5H

    C)  1.5H            

    D)  10 H

    Correct Answer: B

    Solution :

     From Faradays law of electromagnetic induction, the mutual induction of two coils is equal to the numerical value of the induced emf in one coil, for unit rate of change of current in the other. \[M=-\frac{e}{\Delta \,i/\Delta \,t}\] Given, \[e=1500\,V,\frac{\Delta \,i}{\Delta \,t}=\frac{-3}{0.01}\] \[\therefore \] \[M=-\frac{1500}{(-3/0.01)}=5\,H\].


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