MCQ
The average $e.m.f$. induced in a coil in which a current changes from $0$ to $2 \,A$ in $0.05$ $s$ is $8 \,V.$ The self inductance of the coil is....$H$
- A$0.1$
- ✓$0.2$
- C$0.4 $
- D$0.8$
✓
Answer
Correct option: B.
$0.2$
b
(b) $e = - L\left( {\frac{{di}}{{dt}}} \right) \Rightarrow 8 = - L \times \left( { - \frac{2}{{0.05}}} \right)$ $ \Rightarrow \;L = 0.2\,H$
(b) $e = - L\left( {\frac{{di}}{{dt}}} \right) \Rightarrow 8 = - L \times \left( { - \frac{2}{{0.05}}} \right)$ $ \Rightarrow \;L = 0.2\,H$
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