how to make magnets and uses for them
making a magnet
Apparatus and materials-Copper wire, PVC-covered, 150 cm with bare endsiron fillingsRod, hard steelTintacks or paper clips, supply ofDe-magnetizing coil (300 turns or 2400 turns)Transformer or low-voltage AC supplypower supply low voltage 1. Use iron filings or a plotting compass to check that the steel rod is not magnetised before proceeding 2 - Wind a few dozen turns of insulated wire around the steel rod. (Leave enough wire free at either end to make connections to the power supply.) 3-Connect the ends of the wire to the low-voltage DC power supply, so that a large current flows round the coil. 4- Switch off the current. Test the steel rod again to see if it has become magnetised. 5 - Determine where the rod's magnetic poles are. 6-Devise a method for magnetising the rod in the other direction.
USES FOR MAGNET
1. Locate metal studs in a wall.2. Seal off air-conditioning vents to improve home heating by placing vinyl-coated sheets over the steel register faces.3. Hang Polaroids of projects-in-process on the lip of a metal shelf above the workbench.4. Collect nails from a porch repair job that have fallen in the grass.5. Prevent corrosion inside your water heater; a magnet placed on the freshwater intake pipe catches damaging metallic calcium particles before they can get inside.6. Pin blueprints onto the side or hood of the truck.7. Create a bulletin board without the use of tacks, tape, or hooks on walls coated with "magnetized" paint containing metals.8. Protect a tractor's engine: Ceramic magnets placed in the oil pan will attract steel bits that get into the oil from grinding pistons.9. Fasten steel framing squares to the outside of toolboxes for quick access by gluing magnets to the box sides.10. Clean up metal shavings that have fallen from the bench grinder onto the workshop floor.
How to make a homemade electro-magnet