# Basic coil/magnet behavior

1. Aug 14, 2014

### carpekd

Hello all,

In the sketch attached below, I have a cylindrical coil with a cylindrical permanent magnet located in the center (assume the magnet can only move in the axial A-B direction). It is my understanding that if the coil had current flowing through it so that side A was the south pole and side B was the north, and the permanent magnet started in the position shown, the permanent magnet would move towards A and settle in the center of the coil (please correct me if that is inaccurate). What I can't visualize is where the permanent magnet would settle (again starting from the position shown) if the current was reversed and the A side was the North pole and the B side was the south pole... Would the north end of the magnet (the outside surface) line up with the outside surface of the B side on the coil?

- confused mech engineer

#### Attached Files:

• ###### magnet-coil.gif
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2. Aug 14, 2014

### the_emi_guy

Yes. It would be just like two permanent magnets stuck together at a single N-S edge.

3. Aug 15, 2014

### carpekd

Thanks for clearing that up!