A circular coil of radius 10cm is placed in a uniform magnetic...

Flux as a function of time $ϕ = \overset{\to}{B} \cdot \overset{\to}{A} = ABcos ( \omegat )$

Emf induced,

$e = \dfrac{- dϕ}{dt} = AB\omega sin ( \omegat )$

Max. value of Emf $= AB\omega$

$= \pi{R}^{2}B\omega$

$= 3 . 14 \times 0 . 1 \times 0 . 1 \times 3 \times {10}^{- 5} \times \dfrac{\pi}{0 . 2} = 15$