Slide the wire

The animation shows a top view of four wires in a conducting loop and a galvanometer.  Determine the direction of the magnetic field,  Bz(x), passing through the wires at various postions by click-dragging the black wire back and forth and observing the galvanometer reading.  Current flowing into the + terminal, i.e., counterclockwise in the loop, will deflect the meter to the right.   Start.

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