question: What do induction cooktops have under their surface?
distractor3: screws
distractor1: Chambers
distractor2: clumps
correct_answer: electromagnets
support: Induction cooktops have electromagnets under their surface. The magnetic field is varied rapidly producing eddy currents in the base of the pot, causing the pot and its contents to increase in temperature. Induction cooktops have high efficiencies and good response times but the base of the pot needs to be ferromagnetic, iron or steel for induction to work.