An electromagnetic door lock (maglock) is installed in a high-security research laboratory to keep a heavy steel door locked. It consists of an electromagnet mounted on the door frame and a steel strike plate on the door.
Explain why a magnetically soft material, such as iron, is used for the core of the electromagnet rather than a magnetically hard material.
Describe the construction of an electromagnet.
When a scientist scans their ID badge, the system temporarily unlocks the door. Describe the electrical and magnetic changes that occur to allow the electromagnet to release the steel strike plate.