Modern smokestacks use devices called scrubbers to remove large amount of pollution in the form of small particles (soot). Scrubbers use a two steps process: electrons are first added to the soot particle, and an electric force then pulls the particle out of the smoke stream. Consider a soot particle of mass msoot= 3 nanograms (3 x10-12 kg), which corresponds to a diameter of a few micrometers. Some number of electrons have been added to give the particle a total charge qsoot Suppose the collector has a total charge collector = 1.15E-6 C. If the separation between the collector and the soot particle is r = 0.15 m, What is the magnitude of soot (in units of C) so that the electric force exerted on the particle is equal to its weight = mg ?. Use: g=10 m/s, and k = 9x109 N m/C. Number Units y 71 9collector + Collector 9 soot Ground Soot particles moving upward