The magnetic resonance results in a negative permeability; the refraction index is negative as well . ( The lens is not truly flat, since the structure's capacitance imposes a slope for the electric induction .)
12.
Today, the heat source nearest to making significant changes in the way Americans cook is the electric induction cooktop, a smooth surface that uses magnetic principles to heat a pot instantly _ but only the pot and its contents, for the cooking surface remains cool.
