Starter quiz
- Which of the following are types of electric charge?
- positive ✓
- negative ✓
- north-seeking
- south-seeking
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- When two objects at a distance experience forces that pull them towards each other, we say they attract. When two objects at a distance experience forces that push them apart, we say they ______.
- 'repel' ✓
In the diagram, which of the labelled distances is the radius of the black circle?- A ✓
- B
- C
-
- A material that does not allow current to flow through it is called an electrical insulator. A material that allows current to flow through it is called an electrical ______.
- 'conductor' ✓
- When one object rubs against another, the two objects exert forces on each other. What is the name of this type of force?
- drag
- friction ✓
- upthrust
- resistance
- normal contact force
-
- There is a magnetic field around a magnet. Which of the following statements about magnetic fields are correct?
- We cannot see them. ✓
- They cause forces on positively and negatively charged objects.
- They cause forces on north-seeking and south-seeking poles. ✓
-
Exit quiz
- The force between charged objects is called the ______ force.
- 'electrostatic' ✓
- A balloon is rubbed against a wall. After this, it sticks to the wall. Which of the following statements explain why the balloon sticks to the wall?
- The balloon and wall have equal and opposite charges. ✓
- The balloon and wall have equal charges of the same type.
- Atoms have transferred between the balloon and the wall.
- Nuclei have transferred between the balloon and the wall.
- Electrons have transferred between the balloon and the wall. ✓
-
- The arrows on electric field lines point in the direction of the force on…
- any charge.
- a positive charge. ✓
- a negative charge.
- a north-seeking pole.
- a south-seeking pole.
-
- How does an electric field diagram show areas where the field is stronger?
- The field lines are closer together. ✓
- The field lines are farther apart.
- The field lines are thicker.
- The field lines are thinner.
- The diagram does not show this.
-
The picture shows five small positive charges in the field of a large positive charge. Which small charge has an arrow that correctly points in the direction of the force due to the large charge?- A
- B
- C ✓
- D
- E
-
- A small metal pie tin is placed on top of a Van der Graaff generator’s dome and the generator is switched on. After a short time, the pie tin moves up. Which of the following statements explains why?
- The pie tin gains the same type of charge as the dome. ✓
- The pie tin gains the opposite type of charge to the dome.
- The electrostatic force on the tin becomes less than its weight.
- The electrostatic force on the tin becomes greater than its weight. ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Two unlike electric charges attract each other.
- Two like electric charges repel each other.
- There is an electric field radiating out from an electric charge.
- Electric field lines show the direction of force on a positive electric charge.
- The closer electric field lines are to each other, the stronger the electric field.
Common misconception
Pupils think that electric field lines show the movement of moving charges, rather than the force acting on them.
Add force arrows to electric field diagrams to show the size of the force they represent at different points.
Keywords
Positive electric charge - The type of charge produced when electrons are removed.
Negative electric charge - The type of charge produced when electrons are gained.
Electrostatic force - The type of force due to electrically charged objects.
Van der graaff - A device that produces electric charge and is used in electrostatic experiments.
Electric field - The invisible field around a charged object that causes another charged object to experience a force.
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