This diagram shows a positively charged sphere hanging by an insulating thread close to an earthed metal plate.

a. Copy the diagram and draw five lines to show the electric field near the plate and the sphere.
b. Explain why the sphere is attracted towards the metal plate.
c. The sphere is now replaced with a similar negatively charged sphere.
i. Explain what would be observed when the sphere is brought near to the earthed metal plate.
ii. Describe any changes to the electric field that would occur.

Transcribed Image Text:

metal plate positively charged sphere Figure 21.17