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Calculate the magnitude and direction of the Coulomb force on each of the three charges connected in series:
1st - 6 micro Coulombs (positive charge)
2nd - 1.5 micro Coulombs (positive charge)
3dr - 2 micro Coulombs (negative charge)
Distance between 1st and 2nd - 3cm
Distance between 2nd and 3rd - 2cm

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