Question: what is the average induced emf in the loop?
Answer: The loop is grasped at points A and B and stretched until it closes. If it takes 0.20s to close the loop, find the magnitude of the average induced emf in it during this time. The average induced emf is thus: emf = N (DF / Dt) = (6.8×10-3Tm²)/(0.20s) = 3.4×10-2V = 34mV.