Metal should not be placed inside a microwave oven. When metal objects are exposed to microwaves, it can cause a range of potentially dangerous reactions.
When microwaves encounter metal, they can cause a phenomenon called "arcing." Microwaves induce electric currents in the metal, which can lead to sparks or electrical discharges. This can be hazardous as it may cause damage to the microwave oven, create a fire hazard, or even result in personal injury.
The reason for this is that metal is a good conductor of electricity, and the microwaves cause the electrons in the metal to move rapidly. The movement of electrons generates heat and can create sparks.
Furthermore, if a metal object inside a microwave oven is grounded, it may still react with the microwaves. Grounding helps to divert electrical currents to the ground, but it does not eliminate the risk of arcing. The presence of metal in a microwave can disrupt the microwave's internal electromagnetic field and cause unpredictable and potentially dangerous reactions.
Therefore, it is crucial to never place metal objects inside a microwave oven, as it can damage the oven, pose a fire risk, and potentially harm individuals nearby. Always use microwave-safe containers and utensils made specifically for use in microwave ovens.