Craig is modeling the discovery of electromagnetism

Which procedure should he use?

A) moving a magnet into a coil of wire in a closed circuit.

B) moving a magnet into a coil of wire in a open circuit.

C) bringing a compass near a wire that has no electric current.

D) bringing a compass near a wire has a electric current

Answer: The correct answer is "bringing a compass near a wire has a electric current".

Explanation:

Electromagnetism is an interaction between the electric field and the magnetic field.

The moving charge creates both electric field and the magnetic field. The electric current generates magnetic field.

The current carrying conductor produces the magnetic field around it. If the compass needle is placed near this wire then it shows the deflection. It shows the presence of magnetic field near the current carrying wire.

To discover the electromagnetism, bring a compass near a wire which is carrying current.

Therefore, the correct option is (D).

Craig should use this procedure;

D) bringing a compass near a wire has a electric current