bar magnet question

[robcampbell at actrix.co.nz]

Hi!

I think it's more important to get students thinking in a scientific way
than to explain things to them.

Why not get a group of students to investigate the field lines and
generate their own explanation?  (Honestly I don't know the answer, and
this is what I'd have to do to find out.)

Good luck!

Rob Campbell

===================

Can someone give please give me a satisfying explanation to the
following observation from one of my year 13 students.


If you put to bar magnets with like poles facing they repel. If you
separate them with a keeper (about 2 cm long ) they are both attracted to
it. ie. the attractive force to the keeper is greater than repulsive force
between the poles.


What is going on with field lines here?


cheers


John Bull
St John's College
Hamilton

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