- An empty matchbox, or a length of heavy cardboard
- A spool of thin wire. - Sticky-putty adhesive or something equivalent.
- Sticky tape. - A wood block. - Two thumb tacks. |
1) Wind the wire neatly around the matchbox, or cardboard, within 5mm from each end. When you have wound the wire from one end to the other, tape the end. 2) Fasten the coil to the wood block, with the sticky-putty. Remove the insulation from both ends of the wire and connect the wire to the two thumbtacks inserted in the block of wood. 3) Put some sticky-putty adhesive on the back of the compass. 4) Place the compass on top of the coiled wire. |
| A magnetic field is created when electricity flows. The magnetic field will make the needle of the compass move. You can use your electricity tester to see if electricity is flowing. |
(about 2 1/2-3') long folded 6 times.
- A small compass.