Cutting up food and placing it in a microwave can make a difference in the way it's cooked. Here's why:
Even Heating: When food is cut into smaller pieces, it allows for more even heating in the microwave. Since microwaves primarily heat food through the absorption of electromagnetic waves by water molecules, smaller pieces of food can absorb the energy more efficiently. This reduces the chances of uneven cooking, where the outer parts may become overcooked while the center remains undercooked.
Faster Cooking Time: Smaller food pieces will generally cook faster in the microwave compared to larger pieces. The microwave energy can penetrate and heat smaller items more effectively, resulting in quicker cooking times. This can be beneficial when you need to prepare a meal or reheat food in a time-efficient manner.
Regarding your second question, the microwave energy does not start at the exact center of an object. Instead, it penetrates the food from all sides. In the case of multiple items, the microwave energy will be absorbed by each item individually, and the center of each item will act as a starting point for the energy absorption. The exact distribution of energy within the food can vary depending on the shape, size, and composition of the items being heated.
It's important to note that even when food is cut up, you should still use appropriate cookware and cover the food to ensure even cooking and prevent moisture loss. Stirring or rotating the food during the cooking process can also help promote more uniform heating. Additionally, always follow the microwave manufacturer's guidelines and use a food thermometer to ensure that the food reaches a safe internal temperature throughout.