An industrial magnetic lifter is used in a recycling yard to pick up and move scrap iron. It contains a large electromagnet.
State why the core of the electromagnet is made of a soft magnetic material, such as iron, rather than a hard magnetic material.
Describe the construction of an electromagnet.
When the operator wants to release the scrap iron, they press a switch to turn off the lifter. Describe the electrical and magnetic changes that allow the electromagnet to release the iron.