Hang a nail at one end of the thread, attach a dynamometer to the other end of the thread. Bring a nail to the left edge of the bar magnet and then pry it away from the magnet, noticing the approximate maximum tension of the dynamometer spring. Repeat the experiment several times, touching the various places of the magnet along its A length with a nail, closer and closer to its middle. Draw a conclusion from experience about the presence of poles and a neutral line in a permanent magnet. Where they are?
The poles of the magnet are at the edges of the magnet, the neutral line is exactly in the middle of the magnet.
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