Final answer:
Coiling wire into a solenoid aligns magnetic fields from each loop, strengthening the overall magnetic field of the electromagnet, in accordance with principles of electromagnetic induction and electromotive force.
Step-by-step explanation:
When making an electromagnet, you coil the wire because each loop of wire contributes to the overall magnetic field.
Coiling wire into a solenoid—a cylindrical coil of wire—allows the magnetic fields of each turn to align with each other, which strengthens the resulting magnetic field inside the solenoid. According to electromagnetic induction, a change in magnetic flux through a coil induces an electromotive force (emf).
When current flows through these coils, it creates a magnetic field, and the more turns of the coil, the stronger the magnetic field that is produced.
To enhance this effect, the coils are often wrapped around a ferromagnetic core, such as iron, which becomes magnetized and increases the magnetic field's strength.