Three isolated conducting spheres have radii 1 cm, 2 cm, and 3 cm. Sphere 1 initially carries +4 nC, sphere 2 carries –2 nC, and sphere 3 is uncharged. The following sequence is performed:
1. Sphere 1 is touched to sphere 2 and then separated.
2. Sphere 2 is touched to sphere 3 and then separated.
What is the final charge on sphere 3?
a) 0.67nC
b) 1.11nC
c) 0.80nC
d) 0.53nC