Why do potatoes spark in the microwave?

Why do potatoes spark in the microwave?

Why do potatoes spark in the microwave? “Arcing,” according to the Canadian Food Inspection Agency, usually happens with foods that contain high amounts of minerals, including iron, magnesium, and selenium. Since those minerals act like “tiny pieces of metal,” microwaves bounce off them just like they would a fork, causing the sparking effect. Can you…