Can I use a magnetic stirrer to test the magnetic properties of an aluminum coil?

No, you cannot use a magnetic stirrer to test the magnetic properties of an aluminum coil. Aluminum is a non-magnetic material, meaning it does not respond to magnetic fields in the way magnetic materials like iron, nickel, or cobalt do. A magnetic stirrer operates by creating a rotating magnetic field to stir substances, but since aluminum is non-magnetic, it will not be affected by the stirrer's field. To test magnetic properties, you would need to use materials that are ferromagnetic or paramagnetic, or employ other methods such as a magnetometer for measuring magnetic fields.