Question

characterizing electromagnets
a bar magnet is a permanent magnet, while an electromagnet is a temporary magnet.
why is an electromagnet temporary?

Explanation:

An electromagnet is made by winding a coil of wire around a core (like iron). When an electric current flows through the wire, it creates a magnetic field. But when the current is turned off, the magnetic field disappears. This is because its magnetism depends on the presence of an electric current. In contrast, a permanent magnet (like a bar magnet) has its magnetism due to the alignment of its internal atomic structure in a way that doesn't rely on an external current.

Answer:

An electromagnet is temporary because its magnetism exists only when an electric current is flowing through the coil of wire around its core. When the current stops, the magnetism ceases.