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Three identical metallic conducting spheres carry the following charges: q1= +5.80 μC, q2 = +2.60 μC, and q3= -6.80 μC. The spheres that carry the charges q1 and q2 are brought into contact. Then they are separated. After that, one of those two spheres is brought into contact with the third sphere that carries the charge q3; those two are then separated as well. 

a) What is the final charge on the third sphere?

b) How many excess (or deficiency) electrons make up the final charge on the third sphere? Electrons

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