WHICH IS THE MAGNET?
You have two cylindrical rods of iron, identical in size and shape. One is a permanent magnet. The other is just nonmagnetized iron—attractable by magnets, but not a permanent magnet itself.Without any instruments, how can you determine which is which?
Take the two bars, and put them together like a T, so that one bisects the other (see Figure). If they stick together, then bar B is the magnet.
If they don’t, bar A is the magnet. That’s because bar magnets display no magnetic force at their centers since the two poles cancel out. So if bar A is the magnet, then bar B wouldn’t be attracted to its center. However, bar magnets are quite alive at their edges (i.e., the magnetic force is concentrated). So if bar B is the magnet, then it will attract the iron of bar A at any point.
Solution: Configure the two magnets like a T.
Post your Comments below...
Comment Form is loading comments...