What sort of EM field is produced in an induction heater? And how to measure it? That's it, basically. Assuming an induction heater is running on 200khz, and consuming about 3000 watts, how would I go about measuring the magnetic field produced in its coil? Now, I'm rather confused about all the B-field and H-field magnetic fields, and which of them (or both) exist in the coil, and how to measure them? What sensor would I require? My research so-far concludes that I'd probably need a hall effect sensor to measure this, is this correct?