If you accidentally put a plate with metal in the microwave and it starts to spark or light up, you should immediately turn off the microwave to avoid any potential hazards. Microwaving metal objects is dangerous and can cause damage to your microwave and pose a fire risk.
Here's what you should do:
Turn off the microwave: As you've already done, turn off the microwave as soon as you notice any sparks or unusual behavior.
Remove the metal object: Use oven mitts or a towel to carefully remove the plate with metal from the microwave. Be cautious as the plate may be hot.
Inspect the microwave: Check for any damage to the microwave's interior. If you see any burn marks or other signs of damage, it's best not to use the microwave until it's been inspected and repaired by a professional.
Clean the microwave: If any debris or residue from the metal is left in the microwave, clean it thoroughly before using it again.
Avoid using metal in the microwave: Remember that metal objects should never be placed inside a microwave. Metal can cause sparks and potentially start a fire due to the way microwaves interact with metal surfaces.
Using metal in the microwave can also lead to electrical hazards and damage the microwave's components. To heat up your pizza safely, transfer it to a microwave-safe plate or container made of glass, ceramic, or microwave-safe plastic. Always follow the manufacturer's guidelines and safety precautions for using your microwave to prevent accidents and ensure its longevity.