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Q3 Estimate the surface charge density that is required to "float" an electron 107? mabove a plastic cutting board. Hints: What force must be cancelled by the electric force for the electron to float? Find the value of this force. Take the electron mass to be m. = 9 x 10-*! kg Estimate the area of a plastic cutting board. What model can you use for the plastic board charge distribution (look at the Model 23.1 in book)? * The surface charge density is the charge divided by the area and it is denoted 77 in this course (units are Cm