strippers&dykes
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- Location
- Mes,AZ
What causes a magnetic door to function? ( i.e. what is the magnetism called)?
It was a question on an application for a job. View attachment 5570
Those are some of the worse question I have seen in a long time. Most are not answerable.
The question in your attachment (which I agree is very badly written) is not about magnetic doors. It is about magnetic door holders. I have only seen these in association with a Fire Alarm System, and only in doors within corridors. There may be other applications. What you have is an electromagnet within the wall, and a piece of metal within the door. When you open the door, the electromagnet attracts the metal piece, and thereby holds the door open. If a fire alarm occurs, the current is removed from the electromagnet, and a spring will force the door to close. The purpose is to establish a smoke barrier, and to prevent a draft of air from feeding the fire.What causes a magnetic door to function?
What causes a magnetic door to function? ( i.e. what is the magnetism called)?