2. Solved Papers
  3. JEE Main & Advanced
  4. Physics
  5. Electro Magnetic Induction

JEE Main & Advanced Physics Electro Magnetic Induction JEE PYQ-Electro Magnetic Induction

  • question_answer
    When current in a coil changes from 5 A to 2 A in 0.1 s, an average voltage of 50 V is produced. The self-inductance of the coils is:                       [JEE ONLINE 10-04-2015]

    A) 3H

    B) 1.67 H

    C) 6 H     

    D) 0.67 H

    Correct Answer: B

    Solution :

    [b]
    \[{{I}_{1}}=5A\]               \[{{I}_{2}}=2A\]
    \[\Delta I=2-5=-3A\]
    \[\Delta t=0.1\sec \]
    \[Emf=50v\]
    \[emf=\varepsilon =-L\frac{di}{dt}\]
    \[50=-L\left( \frac{-3}{0.1} \right)\]
    \[50=30L\]
    \[L=\frac{5}{3}=1.67H\]


You need to login to perform this action.
You will be redirected in 3 sec spinner