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Practice Test Problem 2.5 [3 pt(s) _] A positively charged pith ball which may be treated as a point charge with charge Q = +InC floats between two infinite charges planes. Gravity acts in the -y direction. The charge densities on the two planes have the same magnitude lob| = lo, ), but may have different signs. If the pith ball has mass 60mg = 6 x 10 5kg, compute the magnitude of the charge density lo | = lo | required to make the pith ball float. Select One of the Following: (a) 4.9nC/m2 (b) 10, 400C/m2 (c) 5.2/C/m2 (d) 10.4 C/m2