My mother-in-law bought an induction cooktop 20 years ago when she redid her kitchen after a house fire. The first time I went over she was cooking and the pots and pans had paper towels under the pans! I was so shocked that I pulled up a stool next to the stove and just watched and asked questions for the next thirty minutes. I have always wanted one. I am concerned if it creates an electromagnetic field, which I have found to be detrimental to one's health. So I have more research to do....
Magnetic fields are the same fields that suround the Earth and protect us from much harmful radiation that is constantly bombarding our planet. And if you don't already know it, every time you activate an electric appliance, be it an iron for your clothes, your washing machine, a light, your tv, your stereo, or any other device that uses electricity, you create electro-magnetic waves. The physics of electricity is such that any time any electrical current passes through a conductor, an electro-magentic field is created, it's strength being proportional to the amount of current. Conversely, any time a conductor is passed through a magnetic field, an current is induced in that conductor. That is how an induction stove works.
An electric current is passed through a winding (wire wrapped around a usually metal core), which creates a magnetic field. Since alternating current is used, the field is alternately growing and collapsing. This moving field passes through the metal pan, usually steel or iron. This creates eddy-currents in the pan metal, and teh pan metal being a relatively poor conductor, the eddy currents encounter resistance. This resistance property creates heat in the metal. It's the same thing that happens when you turn on a light. The wire filament in the bulb heats in relation to the current passed through it, until it get hot enough to glow.
And if you want to talk about magnetic fields, think of the bass speaker in your stereo. It takes subtantial amounts of current to generate a moving field strong enough to move the big speaker mebrane at anywhere from 15 cycles per second (15 herts) to 2500 yccles per second. I would suspect that the magnetic fields created by a good sub-woofer, or bas speaker are far greater than those used in a magnetic induction cooktop.
Plus, magentic field strength decrease by, I think, the square of the distance. That means that if you had a magnetic field strenth of 25 gaus at 2 centemeters, then at 4 centemeters, the field strength would decrease to 5 gaus.
Your car generates tremendous magnetic fields, especially around the alternator. Your refrigerator has a fairly hefty electric motor on board that drives a compresor. I generates a powerful magnetic field when running.
So, I wouldn't be so worried about an induction range.
Seeeeeeya; Goodweed of the North