Answer:physical: a part falling off or changing a tire. chemical:rust
Explanation:
Electromagnet is a type of magnet which is produced by passing electric current through a magnetic material such as iron. Here electric energy is converted to magnetic energy. The magnetic material is coiled with wire through which electric current is passed. Increasing the number of coils and increasing the strength of the current increases the strength of the electromagnet. However, the electromagnet loses its magnetic properties when the current flow is switched off.
(Answer) (1) Increase the number of coils and increase the strength of the current.
I believe the correct answer from the choices listed above is the second option. The type of change and the explanation for the change in calcium carbonate would be that it is a <span>physical change </span>because even though a particle size change was observed, the calcium carbonate retained its original properties and was not transformed into a new substance.
The amount of pressure should be reduced by one half.
Hope this helps! :)