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A square loop of side $$15 \text{ cm}$$ being moved towards right at a constant speed of $$2 \text{ cm/s}$$ as shown in figure. The front edge enters the $$50 \text{ cm}$$ wide magnetic field at $$t = 0$$. The value of induced emf in the loop at $$t = 10 \text{ s}$$ will be :
Side of square loop,
$$a=15\ \text{cm}$$
Speed of loop,
$$v=2\ \text{cm s}^{-1}$$
Time taken by the complete loop to enter the magnetic field:
$$t=\frac{15}{2}=7.5\ \text{s}$$
Since,
$$10\ \text{s} > 7.5\ \text{s}$$
the complete loop is inside the magnetic field at t=10 s.
Therefore, magnetic flux linked with the loop does not change.
$$e=\frac{d\phi}{dt}$$
Since,
$$\frac{d\phi}{dt}=0$$
Hence,
$$\boxed{e=0}$$
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