Q. A 800 turn coil of effective area 0.05 $m^2$ is kept perpendicular to a magnetic field $5 \times 10^{-5}$ T. When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :

A) 2 V
B) 0.2 V
C) $2 \times 10^{-3}$ V
D) 0.02 V
Explanation

[Solution] $e = \frac{N\Delta\phi}{\Delta t} = \frac{800 \times 5 \times 10^{-5} \times 0.05}{0.1} = 0.02$ V. Answer (4).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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