### Re: why does a magnet repel after it breakes? ===|===

Date: Mon Feb 26 22:36:02 2007
Posted By: Yaxun Liu, Postdoctoral Fellow
Area of science: Physics
ID: 1172241392.Ph
Message:
```
Whether the broken magnet attracts or repels each other depends on what its
poles look like.

If the original magnet looks like
+-----------------------------+
N |                             | S
+-----------------------------+
After it's broken, it becomes
+-----------+   +---------------+
N |           |S N|               | S
+-----------+   +---------------+
So the two parts will attract each other.

However, if the original magnet looks like
N
+--------------------------------+
|                                |
+--------------------------------+
S

After it's broken, it becomes

N                    N
+---------------+   +-----------------+
|               |   |                 |
+---------------+   +-----------------+
S                    S

Therefore the two parts will repel each other.

Of course, these two cases are only two simple cases. In reality, the poles
of a magnet can be more complicated. This just illustrates how the poles
affect behavior of magnets.

```

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