9. A metal sphere with a charge of -2.50 x 10º C is 1.50 cm to the left of a second metal sphere with a charge of +1.50 x 109 C. A third metal sphere of -1.00 x 109 C is situated 2.00 cm to the right of the second charged sphere. If all three charges form a line, determine the net electrostatic force on the second sphere. [1.16 x 104 N [left]]
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