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Two point charges Q1 = 30.0 nC and Q2 = -40 nC are held fixed along...

Two point charges Q1 = 30.0 nC and Q2 = -40 nC are held fixed along the x-axis. Q1 is at x = 0 and Q2 is at x = 72.0 cm. A third particle, of mass m = 2.2 x 10-6 kg, has charge Q3 = 42µC. If Q3 is released from x = 28 cm, what is its initial acceleration?

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