Question

Two small spheres with mass m= 15.0g are hung by silk threads of length L = 1.20 m from a common point. When the spheres are given equal quantities of negative charge, so that , each thread hangs at from the vertical. a) draw a diagram showing the forces on each sphere. Treat the sphere as point charges. b) Find the magnitude of q. c) both thread are now shortened to length L=0.600m, while the charges remain uncharged. What new angle will each thread make with the vertical?

Answer 1

If you return I can probably help you with the rest.

Answer 2

Here. What did you mean by dw?