Question 203: Electromagnetic Induction

Question

A magnetic field $4 	imes 10^{-2} \mathrm{~T}$ acts at right angles to a coil of area $100 \mathrm{~cm}^2$ with 50 turns. The average e.m.f. induced in the coil is 0.1 V , when it is removed from the field in time ' $t$ '. The value of ' $t$ ' is

Accepted Answer

$$ \begin{aligned} &\begin{array}{ll}  & \mathrm{e}=-\frac{\mathrm{d} \phi}{\mathrm{dt}}=-\frac{\left(\phi_2-\phi_1ight)}{\mathrm{t}}=-\frac{(0-\mathrm{NBA})}{\mathrm{t}} \ 	herefore & 0.1=\frac{50 	imes 4 	imes 10^{-2} 	imes 10^{-2}}{\mathrm{t}} \end{array}\ &	herefore \quad 	ext { The value of ' } t 	ext { ' is, }\ &\mathrm{t}=\frac{2 	imes 10^{-2}}{0.1}=0.2 \mathrm{~s} \end{aligned} $$

Answer

0.02 second

Answer

0.05 second

Answer

0.2 second

Answer

2 second

Electromagnetic Induction

A magnetic field 4 \times 10^{-2} \mathrm{~T} acts at right angles to a coil of area 100 \mathrm{~cm}^2 with 50 turns. The average e.m.f. induced in the coil is 0.1 V , when it is removed from the field in time ' t '. The value of ' t ' is

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