The magnetic flux density changes from +10 T to -10T in 5 seconds. The area of the coil is 2.5 m^2. What is the average emf induced?
By Faraday's law, this will be equal to the change in magnetic flux linkage / the time taken for this change to occur. But the net change in magnetic flux linkage is 0, so there should be no 'net' emf induced.. Intuitively, however, I know that there will be some non-zero emf induced because the flux in the circuit is changing.