Two small insulating spheres are attached to silk threads

Last updated: 6/9/2023

Two small insulating spheres are attached to silk threads The spheres have equal masses of 40g and have electric charges of q 2 0 C and q 2 0 C The spheres are brought into the initial positions shown in Figure a with a vertical separation of 15 cm between them In figure the upper thread is slowly pulled upward while point B is kept fixed When point A has been raised through a height h the lower sphere suddenly falls as shown in Figure b The height h is closest to A 9 cm B 11 cm D 15cm C 13 cm 91 T 15 cm B a h A 892 b