question_answer 4)

A rectangular wire loop of sides 8 cm and 2 cm with a small cut is moving out of a region of uniform magnetic field of magnitude 0.3 T directed normal to the loop. What is the e.m.f. developed across the cut if the velocity of the loop is in a direction normal to the (a) longer side, (b) shorter side of the loop? For how long does the induced voltage last in each case?  

Answer:

Using  when                 (i) velocity of loop is in the direction normal to the longer side, we get                                 = 0.24 mV                 Using   we get                                 (ii) velocity of loop is in the direction normal to the shorter side                 Here                 = 0.06 mV                 Time, .