Physics

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Sphere W (with an initial charge of zero) is touched to sphere A and then they are separated. Next, sphere W is touched to sphere B (with an initial charge of -26e) and then they are separated. Finally, sphere W is touched to sphere C (with an initial charge of 46e), and then they are separated. The final charge on sphere W is 16e. What multiple of e gives the initial charge on sphere A? (All 4 spheres are the same size)

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