How would you make an electromagnet? (A) Wrap insulation around a magnetic material, and create an electromagnetic field around the magnet. (B) Cover a magnet with insulation, and apply an alternating electrical current to the magnet. (C) Cover a twisted ferromagnetic material with insulation, and apply a direct current to the coil. (D) Wrap an insulated wire around a metal with ferromagnetic properties, and apply an electric current.
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