1. The problem statement, all variables and given/known
Sphere A has a mass=4.2X10^-2 kg and iA tethered to a wall by a thin thread.
Excess of electrons for A=1.2X10^12
Excess of electrons for B=3.5X10^12
Distance between A and B=0.23m
find the angle between the thread and the wall
Homework...