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Maxwell2D: Potato in a microwave oven

Dielectric constant distribution

Microwave ovens utilize microwave radiation with a wavelength of around 12 cm (2.45 GHz). The holes in the window are much smaller than the wavelength and hence virtually no radiation can escape. At this frequency, the water in food absorbes microwave radiation via the imaginary part of the refractive index.
Wikipedia link: Microwave oven

Electric field animation

Time-averaged Poynting vector

This is an animation of the component of the electric field out of the plane of the page.The direction in which energy is travelling at any instant is proportional to the cross product of the electric and magnetic fields, known as the Poynting vector. The arrows show the direction of the Poynting vector averaged over the simulation, while the colours show its strength.