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Millikan's Experiment 1 In a student experiment, a charge, q, on a plastic sphere of mass 7.2 x 10 16 kg, is suspended between two charged plates with a potential difference of 99 V and a plate separation of 4.5 mm. (7) Based on the evidence in Millikan's Experiment 1, the sign of the electric charge on q is _ and the direction of the electric force on q is _ _. This statement is correctly completed by the following, in order of the blanks: Select one: a. positive, up O b. positive, down O c. negative, up O d. negative, down Next