Considering the definition of electromagnet and permanent magnet, the correct answer is option D: An electromagnet is different from a permanent magnet because a electromagnet can turn on and off.
An electromagnet is magnetized by the magnetic field generated by an electric current in a coil of wire. The more current flows through the coil, that is, the stronger the magnetic force of the electromagnet.
A permanent magnet is an object capable of maintaining the state of magnetization for a long period of time. Unlike an electromagnet, a permanent magnet can remain in an active state without external support.
So, an electromagnet is nothing more than a magnet whose magnetic field is produced by the passage of electric current. Its behavior is very similar to that of a permanent magnet, with the difference that its intensity can be controlled, increased and decreased, changing the intensity of the electric current that circulates. When the current is finished circulating, when it is disconnected, the magnetism disappears.
For its part, the permanent magnet does not depend on electric current for its operation and to provide its magnetism. The permanent magnet is, as the name implies, permanent, so it is permanently magnetic.
In summary, the correct answer is option D: An electromagnet is different from a permanent magnet because a electromagnet can turn on and off.
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