Question: Consider again the three charges in Figure P18.9 with Q 1 = 2.5 ?C, Q 2 = 4.5 ?C, and Q 3 = -3.5 ?C.

Consider again the three charges in Figure P18.9 with Q₁ = 2.5 ?C, Q₂ = 4.5 ?C, and Q₃ = -3.5 ?C. A fourth charge q = -5.0 ?C is brought from very far away and placed at the origin. ?

(a) How much work is required in this process?

(b) How much work is required to move q from the origin to a distance that is very far away?

Figure P18.9

? y Q Q2 L Q1 I L = 1.5 m 2L Q3

y Q Q2 L Q1 I L = 1.5 m 2L Q3

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