When metal sparks in the microwave, it indicates a potentially dangerous situation. Metal objects should never be placed inside a microwave because they can reflect microwaves and cause electrical arcing, leading to sparks and potentially damaging the microwave or causing a fire hazard.
Attempting to measure the interaction between metal and microwaves inside the microwave while it sparks is not recommended due to safety concerns. Microwaving metal can lead to unpredictable and hazardous results, and placing any measurement device inside the microwave while it is operating with metal objects can pose significant risks, such as damaging the device or causing electrical shock.
If you want to measure the interaction between microwaves and metal safely, you should conduct experiments outside of the microwave environment and use appropriate instruments to observe and measure the effects without the risk of sparking or other safety hazards. Professional scientific equipment and setups can be used in controlled laboratory settings to study such interactions without jeopardizing safety. Remember, always prioritize safety when working with microwaves or any other potentially hazardous equipment.