Cracking the SAT Physics Subject Test

Here’s How to Crack It

7. The magnetic flux down through the loop increases as the magnet
   is moved. By Lenz’s law, the induced emf will generate a current
   that opposes this change. How do we oppose a change of more flux
   downward? By creating flux upward. So, according to the right-hand
   rule, the induced current must flow counterclockwise (because this
   current will generate an upward-pointing magnetic field). As the
   magnet is moved closer to the loop, the magnitude of the magnetic
   field moving through the loop increases, as magnetic field is
   inversely proportional to distance.