Two small charged spheres are suspended from the ceiling, on a silk fiber. The charge on each sphere is +0.10 µC and -0.10 µC. The mass of each of the spheres is 9.0 grams (change to kg). Calculate the separation of the two spheres if the net force acting on the bottom sphere is zero.

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?