Conducting spheres 1,2 , and 3 are placed at three corners of a square. Spheres 1 and 2 at opposing corners are very small and oppositely charged, and the magnitude of the charge on negatively charged sphere 1 is twice the magnitude of the charge on positively charged sphere 2 . Sphere 3 is much larger than the other two and electrically neutral.

(a) Draw the three spheres, showing the approximate distribution of charge on sphere 3.

(b) Sketch a free-body diagram for sphere 2 .