A three-way 120 V lamp bulb that contains two filaments is rated for 100-200-300 W. One filament burns out. Afterward, the bulb operates at the same intensity (dissipates energy at the same rate) on its lowest as on its highest switch positions but does not operate at all on the middle position.

(a) How are the two filaments wired to the three switch positions? What are the

(b) Smaller and

(c) Larger values of the filament resistances?