Microwave oven
It is used to cook the food in a short time. When the oven is operated, the microwaves are generated, which in turn produce a non− uniform oscillating electric field. The water molecules in the food which are the electric dipoles are excited by an oscillating torque. The frequency of oscillating electric field is set at 3GHz which is the natural frequency of oscillation of water molecule. So resonance occurs and water molecules start oscillating with larger amplitude. Hence few bonds in the water molecules are broken, and heat energy is produced. This is used to cook food evenly.
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