A coil of 100 turns of wire is wound on a book lying horizontally on the table. The surface area of

Question

A coil of 100 turns of wire is wound on a book lying horizontally on the table. The surface area of the book is $0.05 \mathrm{~m}^{2}$ and the vertical component of earth's magnetic field has a value of $0.6 	imes 10^{-4} \mathrm{~Wb} \mathrm{~m}^{-2}$ at the place. On turning the book once over about a horizontal axis in $10^{-1} \mathrm{~s}$ the average induced emf will be\

Professor PC Thomas Classes · Answer

Turning the book once over means, turning through $180^{\circ} . 	herefore \mathrm{d} \phi=2 \mathrm{BAN}$\ $\varepsilon=\frac{\mathrm{d} \phi}{\mathrm{dt}}=\frac{2 \mathrm{BAN}}{\mathrm{dt}}=\mathrm{V}$\