Field of a toroid.
| D7-4 | Field of a toroid. |
| Purpose: | To demonstrate force and field from current. |
| Description: | A toroidal winding of heavy wire is made through a horizontal plexiglas sheet. When current is flowing through the toroid, iron filings are sprinkled onto the sheet. The field exists only inside the toroid. |
| References: | El-11. |
| Equipment: | Toroid on a sheet of plexiglass, iron filing and DC power supply. |