A 800 turn coil of the effective area 0.05 m ^ 2 is kept perpendicular to the magnetic field 5 × 10 ^ - 5 T . When the plane of the coil is rotated by 90 ^ o around any of its coplanar axis in 0.1s, the emf induced in

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Correct answer: D. 0.02V

By Faraday's law, induced EMF in coil is equal to rate of change of magnetic flux linked with coil so

$ε = - \dfrac{∆ ϕ}{∆ t}= - \dfrac{{ϕ}_{f} - {ϕ}_{i}}{∆ t}= - \dfrac{0 - NBA}{∆ t}$
$= \dfrac{800 \times 5 \times {10}^{- 5} \times 0.05}{0.1}$
~ & $= 0.02V$

A 800 turn coil of the effective area 0.05 m ^ 2 is kept...

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