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Electromagnetic Induction — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsElectromagnetic Induction1 Mark
MCQ
The current in a coil changes from 4 ampere to zero in $0.1 \mathrm{~s}$. If the average e.m.f. induced is $100 \mathrm{volt}$, what is the self inductance of the coil
  • ✓
    $2.5 \mathrm{H}$
  • B
    $25 \mathrm{H}$
  • C
    $400 H$
  • D
    $40 \mathrm{H}$
✓

Answer

Correct option: A.
$2.5 \mathrm{H}$
(a) $e=L \frac{d i}{d t} \Rightarrow 100=L \times \frac{4}{0.1} \Rightarrow L=2.5 \mathrm{H}$

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