PART A:
The figure shows a wire that is connected to a power supply and suspended between the poles of a magnet. When the switch is closed, the wire deflects in the direction shown.
Which of the dashed boxes A–D represents the position of the north magnetic pole?
SOLUTION:
As he explains in the video, if you point your right thumb towards yourself to represent the direction of the current, and then your pointer finger down to represent the magnetic field pointing from north to south, the middle finger will represent the direction that the wire is displaced.
Working backward, pointing your right thumb toward yourself and middle finger down in the direction of deflection, your pointer finger points to the left. Since this represents the magnetic field from north to south, the dashed box that represents the north magnetic pole is therefore C.
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