7.3.1-3 Coulomb's Law, Electric Field Strength and Electric Potential

21 flashcards · Physics · by TheoTyson

1. Are electric fields attractive or repulsive?

   Electric fields can be attractive or repulsive.

2. Which objects have an electric field?

   Any object with a charge has an electric field.

3. What do like and oppositely charged particles do?

   Oppositely charged particles attract, like charges repel.

4. Where does the charge act in a charged sphere?

   All of the charge acts at its centre.

5. What is ϵ0\epsilon _0ϵ0​ ?

   The permittivity of free space.

6. How does the gravitational force compare to the electrostatic force for subatomic particles?

   The gravitational force is negligible and much smaller than the electrostatic force.

7. What is the relationship between the force on Q1Q_1Q1​ and Q2Q_2Q2​ ?

   The force on Q1Q_1Q1​ is always equal and opposite to the force on Q2Q_2Q2​ .

8. What simplification can be used in calculating the force between two charged particles?

   That air can be treated as a vacuum.

9. What is the electric field strength?

   The force per unit positive charge.

10. Does a point charge have a linear or radial field?

    A point charge has a radial field.

11. What is a uniform field?

    When two parallel plates are connected to the opposite poles of the battery, so the field strength is constant anywhere between the plates.

12. What is the diagram for a radial negative electric field?

13. What is the diagram for a radial positive electric field?

14. What is the trajectory of a charged particle entering a uniform field at a right angle?

15. What is the diagram for a uniform field between two parallel plates?

16. What is electrical potential?

    The electric potential energy per unit positive charge.

17. What is the electric potential at an infinite distance from the charge?

    The electric potential will be zero.

18. What is the electric potential - radius\text{electric potential - radius}electric potential - radius graph of a positive charge?

19. What is the electric potential - radius\text{electric potential - radius}electric potential - radius graph of a negative positive charge?

20. What is electric potential difference?

    The energy needed to move a unit charge.

21. What is the area under a electric field strength - radius\text{electric field strength - radius}electric field strength - radius graph?

    The electric potential difference.