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MJC

In article ,
says...

One of the great mysteries of electronics is "where is the current
going?" Sometimes a thermal imager helps figure that out. A little
magnetometer would be fun, not hard to do these days.

Reading the blurb on the cited current transformer reminded me of a
puzzle for all clamp meters... Surely they are no good clamped on a
normal bi-directional power cable in which the current is both coming
and going: the magnetic fields will near-perfectly cancel out. Surely
you have to split the cable to measure current?

Mike.