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How to use two magnetic rods to identify the unmagnetized rod.
Answer to Problem 1QAP
Keep one rod in the middle and approach other two rods from the both ends of the middle one. And then turn around the 2 rods which are approaching from the ends to change the end that reach the middle one. Do it repetitively changing the middle rod to one another until you find the rod that is in the middle which attracts the two approaching rods even if they are turned around.
Explanation of Solution
Magnetic rods attract unmagnetized iron rods. Magnetic rods attract each other if they are aligned in a way that two opposite poles of the rods meet each other. If the same poles of two magnetic rods are aligned, they repel each other.
When one rod is placed in the middle, if that is a magnet, it will attract the approaching unmagnetized rod regardless of the end of the unmagnetized rod. But the approaching magnetized rod from the other side will be attracted to the middle one in one orientation (only one pole), if it is turned around, it will be repelled.
If the middle one is unmagnetized rod, it will attract to the two magnets that are approaching from the two ends regardless of the orientation of the approaching rods.
Conclusion:
Unmagnetized rod can be determined by the property of magnets. Magnets repel each other when they are oriented in same poles and attract each other when they are oriented to meet the opposite poles. Unmagnetized iron rods attract to both poles of magnets.
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