Why does a copper wire coil wound around an iron nail act as a strong magnet while connected to a glowing…
Why does a copper wire coil wound around an iron nail act as a strong magnet while connected to a glowing circuit, but drops paper clips as soon as the circuit is switched off?
The wire melts when the current stops
An electromagnet retains temporary magnetism only while electric current flows
The iron nail turns permanently into non-magnetic wood
The paper clips get magnetized and repel the nail
Solution
Electromagnets are temporary magnets whose magnetic field exists only as long as electric current passes through the wire coil.