- Make a rectangular coil of #28 magnet wire.
- It should have 5 to 10 turns and measure approximately ½” by 1”.
- Wrap the ends of the wire around the short sides of the coil.
Secure it with about three wraps, and leave the two ends
extended in opposite directions.
- Adjust the coil so that the ends form an axis, around
which the coil can freely rotate. Make sure the coil is