The figure below shows two identical small, charged spheres. One of mass 4.6 g is hanging by an insulating thread of length 20.0 cm. The other is held in place and has charge q1 = −3.0 µC. The thread makes an angle of 18° with the vertical, resulting in the spheres being aligned horizontally, a distance r apart. Determine the charge q2 on the hanging sphere.

 

20.0 cm 18- 92