Question

When asked how to create an electromagnet, the best answer would be, "You can create an electromagnet by
A. applying a direct current to a non–magnetic material in order to create an electromagnetic field."
B.  covering a wire with insulation and applying a direct electrical current to the magnet."
C.  coiling a ferromagnetic material, wrapping in an insulator, and applying a current to the coil."
D.  wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current."

Answer 1

Choice-D will do the job nicely.

Answer 2

The correct answer is D. wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

Explanation

An electromagnet is a non permanent magnet that is created with an electric current .When current flows through a wire it induces  a magnetic field around the wire. When the wire is wrapped around in a coil, the magnetic field that is induced is concentrated in the center of the coil, creating a north and south pole.   The field is that of a solenoid.  

Electromagnets are usually made by wrapping insulated coil of wire around a ferromagnetic metal. This focuses the electromagnetic field and creates a magnet as long as there is current running trough the insulated wire.

The correct answer is D. wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.