Finding the Angle between Thread and Wall for Sphere A

[Andrea Assas]

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 Equations

The Attempt at a Solution

 

[stevendaryl]

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 Equations

The Attempt at a Solution

This might sound picky, but this problem really isn't "Advanced Physics". You need to identify all the forces on sphere A and figure out what angle makes all the forces balance. Draw a force diagram.