SORU: aşağıdaki parçaya göre cevaplayınız
According to the passage, electromagnets ----.
The magnets that are used most commonly, such as the
ones on compasses, those used for fridge decorations,
and in many other everyday tools, are called permanent
magnets. This type of magnet produces an external
magnetic field that attracts or repels iron, and it may lose
its strength when mistreated. Inside a magnet are groups
of atoms called domains. The magnetizing process, which
exposes a material to increasingly strong magnetic fields,
aligns these domains in a single direction, where they
become locked in a crystalline structure. High heat,
radiation, strong electrical currents, or other nearby
magnets, though, can damage that structure, nudging the
domains out of alignment and diminishing the attractive
force. Electromagnets, or non-permanent magnets, a less
familiar type, have magnetic fields that rely on an electric
current. They, thus, do not lose their strength; instead, the
strength of the field can be varied as needed. This makes
them appropriate for various applications, such as
telephone receivers.