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6. Electromagnetic induction — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics6. Electromagnetic induction1 Mark
MCQ
When current in a coil changes from $5\,A$ to $2\,A$ in $0 .1\,s,$ average voltage of $50\,V$ is produced. The self- inductance of the coil is.......$H$
  • A
    $6$
  • B
    $0.67$
  • C
    $3$
  • ✓
    $1.67$
✓

Answer

Correct option: D.
$1.67$
d
According to Faraday's law of electromagnetic induction,

Induced $emf$, $e=\frac{L d i}{d t}$

$50 = L\left( {\frac{{5 - 2}}{{0.1\,{\text{sec}}}}} \right)$

$\Rightarrow  L=\frac{50 \times 0.1}{3}=\frac{5}{3}=1.67\, \mathrm{H}$

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