Q103 / 160 · JIPMER 2004 · Physics

If the current 3 A flowing in the primary coil is made zero in 0.1 sec, the emf induced in the secondary coil is 1.5 volt. The mutual inductance between the coils is

  • Correct answer
    A
    0.05 H
  • B
    1.05 H
  • C
    0.1 H
  • D
    0.2 H

Solution

Here: $e=1.5$ volt $\Delta i=0-3=-3 \mathrm{~A}, \Delta t=0.1 \mathrm{sec}$ Now the emf induced in secondary coil $e=\frac{M \Delta i}{\Delta t} \quad$ (numerically) or $\quad 1.5=\frac{M \times 3}{0.1}$ or $\quad M=\frac{1.5 \times 0.1}{3}=0.05 \mathrm{H}$

Hence, the correct answer is option: 'A'.

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