Problem P. 4624. (March 2014)
P. 4624. Some sparks were observed between the prongs of a fork which was inadvertently put into a microwave oven. The prongs were 5 cm, and the space between them was 4 mm. The frequency of the electromagnetic field was 2.45 GHz. Estimate the magnitude of the electromagnetic induction at the location of the fork. (In the air the maximum electric field that it can tolerate without breakdown is approximately 3 kV/mm.)
Deadline expired on 10 April 2014.
Sorry, the solution is available only in Hungarian. Google translation
Megoldásvázlat. Nagyságrendileg 4 mT.