Problem with Induction #1 O P2 In the picture, the magnetic field is uniform in the region O . shown and it is out of the page. A wire loop is in the plane of OP B the page. Discuss if there is an induced current when the loop is moved from... P 3 O a) P1 to P2. dPB d Faraday's Law: Vind = - B . dA dt dt A Because A is constant, only a change in B will cause a change in flux PB and induce a voltage Wind. As the loop crosses into the region with magnetic field B from the region of zero magnetic field: B increasing - DB increasing - Bind antiparallel to B - Bind 8 - lind CW b) P2 to P3. While moving from P2 to P3, the magnetic flux PB stays constant. Since there is no change in flux DB, according to Faraday's Law, there will be no induced voltage Wind, and, therefore, no induced current lind. c) P3 to P1. Because A is constant, only a change in B will cause a change in flux PB and induce a voltage Vind. As the loop crosses into the region with zero magnetic field from the region with magnetic field B: B decreasing - DB decreasing - Bind parallel to B - Bind O - lind CCW