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  • A coil has 2000 turns and area of . The magnetic field perpendicular to the p

A coil has 2000 turns and area of \mathrm{70 cm^{2}} . The magnetic field perpendicular to the plane of the coil is 0.3\mathrm{ wb/m^{2}} and takes 0.1 sec. to rotate through \mathrm{ 180^{\circ} .}. The value of induced e.m.f. will be :

Option: 1

8.4 volt


Option: 2

84 volt


Option: 3

42 volt


Option: 4

4.2 volt


Answers (1)

best_answer

\mathrm{\begin{aligned} & \mathrm{N}=2000, \mathrm{~A}=70 \mathrm{~cm}^2=70 \times 10^{-4} \mathrm{~m}^2 \\ & \mathrm{~B}=0.3 \mathrm{wb} / \mathrm{m}^2 \\ & \mathrm{t}=0.1 \mathrm{sec} \\ & |\mathrm{e}|=\frac{\mathrm{d} \phi}{\mathrm{dt}}=\frac{2 \mathrm{NBA}}{\Delta \mathrm{t}}=\frac{2 \times 2000 \times 0.3 \times 70 \times 10^{-4}}{0.1} \mathrm{~V}=84 \mathrm{~V} \end{aligned}}

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Deependra Verma

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