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Solution


Q.

A square loop of side 15 cm being moved towards right at a constant speed of 2 cm/s as shown in the 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 s will be                          [2024]
1 0.3 mV  
2 4.5 mV  
3 zero  
4 3 mV  

Ans.

(3)

At t=10 sec. distance moved by loop;

d=v×t=2×10=20 cm

i.e. loop is completely inside the field. At t=10 sec there is no change in flux

Now, emf induced, E=dϕdt=BdAdt=0