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

Copy the diagram and draw five lines to show the electric field near the plate and the sphere.

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

Explain why the sphere is attracted towards the metal plate.

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

The sphere is now replaced with a similar negatively charged sphere.

Explain what would be observed when the sphere is brought near to the earthed metal plate.

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

The sphere is now replaced with a similar negatively charged sphere.

 Describe any changes to the electric field that would occur.

This diagram shows a proton as it moves between two charged parallel plates. The charge on the proton is $+1.6\times {10}^{-19}\mathrm{C}$

Copy the diagram and draw the electric field between the parallel plates.

The force on the proton when it is at position $B$ is $6.4\times {10}^{-14}\mathrm{N}$.

The diagram shows a proton as it moves between two charged parallel plates. The charge on the proton is $+1.6\times {10}^{-19}C$

In which direction does the force on the proton act when it is at position $B$ is ?

This diagram shows a proton as it moves between two charged parallel plates. The charge on the proton is $+1.6\times {10}^{-19}C$

What will be the magnitude of the force on the proton when it is at position $C$ ?

The force on the proton when it is at position $B$ is $6.4\times {10}^{-14}\mathrm{N}$.

This diagram shows a proton as it moves between two charged parallel plates. The charge on the proton is $+1.6\times {10}^{-19}C$

 Calculate the electric field strength between the plates.

The force on the proton when it is at position $B$ is $6.4\times {10}^{-14}\mathrm{N}$.

This diagram shows a proton as it moves between two charged parallel plates. The charge on the proton is $+1.6\times {10}^{-19}C$

Calculate the potential difference between the plates.

The force on the proton when it is at position $B$ is $6.4\times {10}^{-14}\mathrm{N}$.