No, you should not put a stainless steel spoon with a copper bottom or any metal object inside a microwave oven. Microwaves work by generating electromagnetic waves that excite water molecules in food, causing them to heat up and cook the food. When you place metal objects in a microwave, the microwaves can interact with the metal, leading to potentially dangerous consequences.
When a metal object like a stainless steel spoon with a copper bottom is exposed to microwaves, it can cause electrical currents to flow through the metal. This can result in a phenomenon known as "arcing," where sparks may be produced as the electricity jumps across gaps in the metal. These sparks can lead to a fire or cause damage to the microwave oven.
Additionally, the intense heat generated by the electrical currents in the metal can damage the microwave's interior, which is typically designed to reflect and contain microwave radiation safely.
To avoid accidents and potential damage to your microwave oven, never put any metal objects, including stainless steel spoons with copper bottoms, inside the microwave. Stick to microwave-safe utensils and containers made of glass, ceramic, or microwave-safe plastics when using the microwave for heating or cooking food.