The magnetized steel bar and the non-magnetized iron bar have the same appearance.

| March 13, 2021 | education

The magnetized steel bar and the non-magnetized iron bar have the same appearance. How to determine which rod is magnetized and which is not, without using any instruments?

We press one of the rods to the table, the other is used as a movable probe. Evaluate the gravity force (and the breakout force) at the edges of the fixed rod and in the center with the tip of the probe.
There are only two options:
1) The force of attraction is approximately the same when touching any part of a fixed rod. In this case, the probe will be a magnetized steel rod. Its pole is equally strongly attracted to any part of a simple iron rod.
2) The force of attraction of the probe to the edges of the stationary rod is much greater than to the central part. In this case, the stationary rod will be magnetized. The concentration of lines of force at the ends (poles) of the magnet is greater, so a simple iron rod is more strongly attracted to them. In the middle of the magnet, the power lines are rarefied and oriented parallel to its axis. Here the magnetic field tends to orient the probe along the lines of force, the attraction is weak.



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