JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Static EMI

  • question_answer
     The average e.m.f. induced in a coil in which the current changes from 2 ampere to 4 ampere in 0.05 second is 8 volt. What is the self-inductance of the coil? [NCERT 1984; CPMT 1997; MP PMT 1999, 2003; UPSEAT 2000; RPMT 2000; Pb. PMT 2002; RPET 2003; DPMT 2005]

    A)            0.1 H                                        

    B)            0.2 H

    C)            0.4 H                                        

    D)            0.8 H

    Correct Answer: B

    Solution :

               \[e=-L\frac{di}{dt}\Rightarrow 8=L\frac{(4-2)}{0.05}\Rightarrow L=0.2\ H\]


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