Three charged marbles, labeled 91, 92, and 93, are oriented such that 92 is between 91 and 93. The charge on 92 is -13.5 C. E field lines 93 92 91 93 have what sign of charge? ---Select--- (a) 91 and 91 93 ---Select--- (b) If the magnitude of the charge on q is 7.6 C, what is the magnitude of charge on 93?