A fork absorbs the microwaves instead of the food and reflected microwaves form an arc to the metal walls of the microwave.This causes a spark.

Question

Quizplus · Accepted Answer

This is a common cause of sparks in a microwave. The metal in the fork causes the microwaves to reflect and create a buildup of electrical charge, which can result in a spark. It is important to avoid putting metal objects in a microwave to prevent this from happening.

A Fork Absorbs the Microwaves Instead of the Food and Reflected