Question

multiple choice 1 point
copper wire, an iron nail, and a battery can be used to make:
a compass
an electromagnet
a permanent magnet
a lodestone

Explanation:

• A compass has a magnetized needle that aligns with Earth's magnetic field. It doesn't require a battery, copper wire, and an iron nail to be made from scratch in the context of this simple setup.
• A permanent magnet has its own inherent magnetic properties and isn't created using just a battery, copper wire, and an iron nail in a basic experimental - like way.
• A lodestone is a naturally occurring magnetized mineral (a type of permanent magnet), so it's not made with these materials.
• An electromagnet is made by coiling a copper wire (insulated usually, but in a simple sense) around an iron nail and connecting the ends of the wire to a battery. The electric current in the wire creates a magnetic field around the iron nail, magnetizing it.

Answer:

an electromagnet