Electrolytically Charged Sphere
License: CC BY-NC 3.0
Part of an apparatus known as a torsion balance, the spheres are electrically charged and the electrostatic force between them is measured by calculating the equilibrium distance between the two charged spheres.
Can You Apply It?
- When the spheres in the system are initially charged, the force between them when they are brought near one another is:
- The torque is a result of the force that is applied to the sphere over a distance
l, from the axis of rotation. This force takes the form of
Show What You Know
- What relationship exists between the angle of deflection and the voltage applied to the spheres?
- As the distance between the charged spheres increases, what do you expect to happen to the angle of deflection?
- What assumption is being made about the torque equation? (Hint: think about the angle between the force and the lever arm.)