An electromagnet is ____.

A. a permanent magnet

B. made with bar magnets

C. able to attract all metal substances

D. only operating when the current is on

I think it is D..?

You are correct! An electromagnet is only operating when the current is on (Option D). Unlike a permanent magnet, which keeps its magnetism without the need for an external power source, an electromagnet requires an electric current to generate a magnetic field. When the current flows through a wire wrapped around a core, such as iron, it creates a magnetic field, transforming the core into a magnet. This allows the electromagnet to attract metal substances. Once the current is switched off, the magnetic field is no longer present.

That's correct! An electromagnet is only operating when the current is on. Here's an explanation of why:

An electromagnet is a type of magnet that uses an electric current to generate a magnetic field. It consists of a coil of wire, often wrapped around a soft iron core. When an electric current passes through the wire, it creates a magnetic field around the coil. This magnetic field makes the electromagnet attract magnetic materials, such as iron or steel.

However, it's important to note that an electromagnet does not have a permanent magnetic field like a regular magnet. The magnetic field of an electromagnet is only present when there is an electric current flowing through the wire. When the current is turned off, the electromagnet loses its magnetic field and no longer attracts metal objects.

So, option D is the correct choice as it correctly explains that an electromagnet only operates when the current is on.

Yea, You were correct.