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.

The figure with five lines of electric field near the plate and the sphere is shown above. As sphere is positively charged and metal plate is earthed, so the charge will flow from the positive sphere to the negative metal plate or plate with zero voltage and electric field will be directed as shown in figure.

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.

When the positively charged sphere is replaced with the negatively charged sphere, then the negative charge on the sphere now induces positive charges on the metal plate. Since unlike charges attract each other and like charges repel, so the sphere would still be attracted to the plate. The direction of electric field lines reverses since positive charge flows from high potential to low potential.

This diagram shows a proton as it moves between two charged parallel plates. The charge on the proton is + 1 . 6 × 10 - 19 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 × 10 - 14 N .

The electric lines of force will be parallel lines of uniform electric field between the plates.They will be placed in series and are directed vertically downwards. As for positive charge, the force and electric field are in the same direction, so force will be acting downward.

The diagram shows a proton as it moves between two charged parallel plates. The charge on the proton is + 1 . 6 × 10 - 19 C In which direction does the force on the proton act when it is at position B is ?

We know that proton is a positive charge, so in case of positive charge electric lines of force and electric force are directed in the same direction.The electric lines of force will be parallel lines of uniform electric field between the plates.They will be placed in series and are directed vertically downwards. As electric field are directed in downward direction, so force will be in downward direction.

This diagram shows a proton as it moves between two charged parallel plates. The charge on the proton is + 1 . 6 × 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 × 10 - 14 N .

Electric force is given by F = E Q , here, E is electric field and Q is charge. As seen from the above figure, uniform electric field exist between both parallel plates, thus electric field remains same at all points between plates. Charge on proton is also constant, so the magnitude of electric force will be same as the force on the proton at position B . Hence, force on the proton at position C is 6 . 4 × 10 - 14 N .

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A potential difference of $2.4 \mathrm{kV}$ is applied across a pair of parallel plates. The electric field strength between the plates is $3.0 \times 10^{4} \mathrm{~V} \mathrm{~m}^{-1}$.

The plates are now moved so that they are $2.0 \mathrm{~cm}$ apart. Calculate the electric field strength produced in this new position.

Important Questions on Uniform Electric Fields

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AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 21 - Uniform Electric Fields>EXAM-STYLE QUESTIONS>Q 7

A variable power supply is connected across a pair of parallel plates. The potential difference across the plates is doubled and the distance between the plates is decreased to one-third of the original. State by what factor the electric field changes. Explain your reasoning.

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AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 21 - Uniform Electric Fields>EXAM-STYLE QUESTIONS>Q 8

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

Question Image

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

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 21 - Uniform Electric Fields>EXAM-STYLE QUESTIONS>Q 8

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

Question Image

Explain why the sphere is attracted towards the metal plate.

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AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 21 - Uniform Electric Fields>EXAM-STYLE QUESTIONS>Q 8

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

Question Image

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.

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AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 21 - Uniform Electric Fields>EXAM-STYLE QUESTIONS>Q 8

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

Question Image

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

Describe any changes to the electric field that would occur.

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 21 - Uniform Electric Fields>EXAM-STYLE QUESTIONS>Q 9

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

Question Image

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

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

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 21 - Uniform Electric Fields>EXAM-STYLE QUESTIONS>Q 9

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

Question Image

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

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 21 - Uniform Electric Fields>EXAM-STYLE QUESTIONS>Q 9

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

Question Image

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 $6.4 \times 10^{- 14} N$ .

Important Questions on Uniform Electric Fields

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