A student rubs an inflated balloon on a woollen jumper. After rubbing, the balloon is negatively charged.
Name the particles that are transferred from the jumper to the balloon.
State the type of charge left on the jumper after rubbing.
Give a reason for your answer.
Figure 1 shows an isolated metal sphere that carries a positive charge. The sphere creates an electric field around itself.
On Figure 1, draw the electric field pattern around the charged sphere.
Include the direction of the field lines.
Describe how the strength of the electric field changes as the distance from the sphere increases.
Two small polystyrene balls, A and B, are each rubbed with the same woollen cloth and then hung from a support on nylon threads.
Figure 2 shows how the balls hang.
What does Figure 2 show about the charges on the two balls?
Explain why the force between the two balls is described as a non-contact force.
