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You are in a room where there are no objects except for two iron rods Only one of them is a magnet How can you identify the magnet? |
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Answer
Take a rod and touch with its end the middle of the second rod. If they move closer to one another, then you have a magnet in your hand. The real magnet has a magnetic field at its poles, but not in its center. So, as mentioned earlier, if you take the iron bar and touch its tip to the magnet's center the iron bar will not be attracted. This assumes that the magnet's poles are at its ends.
If the poles run through the length of the magnet then it is much more difficult to use this method. In that scenario, rotate one rod around its axis while holding an end of the other to its middle. If the rotating rod is the magnet, the force will fluctuate as the rod rotates. If the rotating rod is not the magnet, the force will be constant (if you keep their positions steady).
Take a rod and touch with its end the middle of the second rod. If they move closer to one another, then you have a magnet in your hand. The real magnet has a magnetic field at its poles, but not in its center. So, as mentioned earlier, if you take the iron bar and touch its tip to the magnet's center the iron bar will not be attracted. This assumes that the magnet's poles are at its ends.
If the poles run through the length of the magnet then it is much more difficult to use this method. In that scenario, rotate one rod around its axis while holding an end of the other to its middle. If the rotating rod is the magnet, the force will fluctuate as the rod rotates. If the rotating rod is not the magnet, the force will be constant (if you keep their positions steady).
First answer by Brave3. Last edit by Brave3. Contributor trust: 972 [recommend contributor]. Question popularity: 45 [recommend question]
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