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 Magnetic Mystery (Posted on 2005-01-25)
You have two identical looking metal bars. One of them is a magnet, with North and South ends. The other is simply an iron bar (which is attracted by magnets).

How can you tell which is which, using only these two bars?

 Submitted by nikki Rating: 3.4000 (5 votes) Solution: (Hide) Make a "T" shape with the two bars such that the end of one touches the middle of the other. Since the middle of the magnet is neutral, touching the end of the iron bar to the middle of the magnet will not produce any force of attraction. But touching the end of the magnet to the middle of the iron bar will produce a force of attraction. So when you make a T shape, whether or not the bars are attracted to each other will tell you which is which. There are other solutions in the comments, but I can't vouch for their validity =)

 Subject Author Date solution Sachin 2005-02-28 17:54:20 ansewer kiersten 2005-02-06 22:00:56 re: easy option? Nosher 2005-01-31 03:17:21 easy option? Murray 2005-01-27 11:14:56 Other methods Hugo 2005-01-26 20:42:39 Well... Daniel 2005-01-26 19:43:14 re: try Penny 2005-01-26 10:17:33 solution, maybe andrei 2005-01-26 08:45:49 try jason 2005-01-26 06:49:06 No Subject Stephen S. 2005-01-25 21:39:59 re(2): Reply to John John 2005-01-25 17:09:56 re: Reply to John John 2005-01-25 17:08:36 re: Reply to John Penny 2005-01-25 17:04:26 Reply to John Penny 2005-01-25 16:55:28 re: Solution John 2005-01-25 16:24:20 I'll take a shot at it John 2005-01-25 16:06:37 Solution Penny 2005-01-25 15:47:44 Solution Fletch 2005-01-25 15:30:29 EASY does it Ady TZIDON 2005-01-25 13:59:27

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