Heart of an induction cooker is a high frequency

Heart of an induction cooker is a high frequency electro magnetic coil, which produce a strong high frequency electro magnetic field. This coil is powered by a high frequency oscillator(20 to 75 KHz). This coil is placed just beneath a shiny ceramic plate (where we place cooking vessels). Whenever a magnetic material (iron, or alloys or iron) is placed over this coil high frequency magnetic filed passes through the pot which generate heat within metal due to Eddy current and Magnetic Hysteresis.