Q12. A square loop of side 15 cm being moved towards right at a constant speed of $2 \mathrm {~cm} / \mathrm { s }$ as shown in figure. The front edge enters the 50 cm wide magnetic field at $t = 0$. The value of induced emf in the loop at $t = 10 \mathrm {~s}$ will\\
\includegraphics[max width=\textwidth, alt={}, center]{694a919f-a664-4e77-a59a-c8889b2816c1-03_305_414_285_315}\\
be :\\
(1) 0.3 mV\\
(2) zero\\
(3) 4.5 mV\\
(4) 3 mV