Edith Floyd

Physics

5 February, 15:27

Electro-magnets are created by ...

A) Applying a charge to a magnetic material, wrapped in an insulator, which creates an electro magnetic field around the magnet.

B) Covering a magnet with insulation in applying an alternating electrical current to the magnet.

C) Twisting a ferromagnetic material, wrapping in an insulator, and applying a direct current to the coil.

D) Wrapping in insulated wire around a medal with ferromagnetic properties and applying an electric current.