Video: Watch this demo
Description: This demonstration visually shows the interaction between a magnetic field and a current carrying rod.
- Large DC power supply
- Large magnet
- Two rods with connectors attached.
- Lightweight/Thin metal rod
- DPDT switch
- 2 table clamps
- 2 long poles
- 2 S clamps
- 6 banana plug cables
- Medium Fine grit sand paper or abrasive pad
- Attach the two rods to a table using the above equipment. Make sure they are level.
- Connect the two rods to a DPDT switch. Connect the switch to the power supply.
- Rub the abrasive pad on the two stationary rods and the small rod (improves contact).
- Position the large magnet under the two rods.
- Set the power supply to high and test to make sure it works.
- Place the small rod on the two large rods.
- Turn on the power supply and close the switch to move the rod. The rod moves because the current in the rod produces a magnetic field that opposes that of the permanent magnet, thus creating a force between the two.
- Move the switch to the other position to make the current flow in the opposite direction. The rod will move in the opposite direction.
- When finished, turn off the power supply.
This power supply outputs 20-30A at low voltage. Although the voltage is low, caution should still be used.