Charge is placed on two conducting spheres that are very far apart and connected by a long thin wire. The radius of the smaller sphere is 5 cm and that of the larger sphere is 12 cm. The electric field at the surface of the larger sphere is 490 kV/m. Find the surface charge density on each sphere.

12 cm sphere
? µC/m^2

5 cm sphere
? µC/m^2