Looking at AC interference

 I pointed the search coil at the back of a plug.

The pattern on the oscilloscope clearly showed that it was picking up a signal from the AC magnetic field. But the induced emf is very small, of the order of 0.01V.

The fluctuation on the signal is also interested. The time base is 5 microseconds per division so the frequency of the large scale oscillation is 100000Hz. Need to look at this again.