Question

which statement best describes the type of magnetism generated by attaching a wire to a battery and wrapping the wire around an iron nail?
a. it only occurs when its touching another magnet.
b. its always occurring.
c. it only occurs when there is an electric current.
d. it only occurs when its near another magnet.

Explanation:

When a wire is attached to a battery (providing an electric current) and wrapped around an iron nail, it creates an electromagnet. Electromagnetism is based on the principle that a current - carrying wire produces a magnetic field. Without an electric current (e.g., if the battery is disconnected), the magnetic effect (magnetism in the iron nail due to the solenoid - like wire setup) disappears.

• Option A: Touching another magnet is not the cause of this magnetism. The key is the electric current.
• Option B: It is not always occurring. It depends on the presence of an electric current.
• Option C: Correct, as the magnetism (in the form of an electromagnet) is generated when there is an electric current flowing through the wire.
• Option D: Proximity to another magnet is not the reason for this type of magnetism. The electric current is the main factor.

Answer:

C. It only occurs when there is an electric current.