7 shows planar loops of different shapes moving out of or
into a region of a magnetic field which is directed normal to the plane
of the loop away from the reader Determine the direction of induced
current in each loop using Lenz’s law FIGURE 6 7
Solution
(i)
The magnetic flux through the rectangular loop abcd increases,
due to the motion of the loop into the region of magnetic field, The
induced current must flow along the path bcdab so that it opposes
the increasing flux