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| Pregunta | Respuesta |
| Where does an electric field form? | Around a charged Object |
| What is charge measured in? | Coulombs- it can be positive or negative |
| Oppositely charged particles... | attract |
| Like charges ... | Repel |
| When a charged object is placed in an electric field ... | It will experience a force |
| What does Coulombs Law calculate? | The force of attraction or repulsion between two point charges in a vacuum |
| What is the value of 'epsilon-nought' | 8.85x10^-12 |
| The force on Q1 is always... | Equal and opposite to the force on Q2 |
| What does the direction depend on? | The charges |
| When the charges are opposite so the force is attractive what will F be? | Negative |
| If the charges are alike and the force is repulsive what will F be? | Positive |
| What type of Law is coulombs Law? | An inverse square law |
| When the charges are further apart what happens to the force between them? | The force becomes weaker |
| What does F also depend on? | The permittivity of the material |
| What is Electric field strength defined as? | The force Per unit of positive charge |
| What are the units for Electric field strength? | NC^-1 |
| What type of quantity is Electric field strength? | Vector- pointing in the direction that a positive charge would move |
| What type of field does a point charge have? | A radial field |
| In a radial field what is E inversely proportional to? | r^2 |
| If the test charge is positive and Q is also positive where would the field lines point? | Point away from the test charge |
| If the test charge is negative and Q is positive where would the field lines point? | Point towards the test charge |
| What does field strength do as you go further away from Q? How can you tell this on a diagram? | It decreases The field lines get further apart |
| In a uniform field what is E inversely proportional to? | D- the distance between the plates |
| In a uniform field the field lines are... | Parallel to each other |
| In a uniform field how does field strength differ? | It is the same at all points between the two plates |
| What is electric potential? | Potential energy per Unit of charge |
| What does the electric potential of a point depend on? | How far it is from the charge and the size of the charge |
| When the force is repulsive V (Electric potential) is... | Positive |
| When the force is attractive V (Electric potential) is... | Negative |
| What is electric potential difference? | The energy needed to move a unit of charge |
| To move a charge across a potential difference what do you need? | To use energy (The work done) |
| What does the work done depend on? | The size of the charge your moving and the potential difference you are moving it across |
| What is a similarity between Gravitational and Electric fields? | g= force per unit of mass E= force per unit of positive charge |
| What is another similarity between Gravitational and Electric fields? | Newtons law of gravitation is an inverse square law Coulombs law is also an inverse square law |
| What is another similarity between Gravitational and Electric fields? | The field line for a point mass and negative point charge are the same |
| What is another similarity between Gravitational and Electric fields? | Gravitational potential 'V' is potential energy per unit of mass and zero at infinity Electric Potential 'V' is potential energy per unit of positive charge and is zero at infinty |
| What is a difference of Gravitational and electric fields? | Gravitational forces are always attractive Electric forces can either be attractive or repulsive |
| What is another difference of Gravitational and electric fields? | Objects can be shielded from electric fields but not from gravitational fields |
| What is another difference of Gravitational and Electric fields? | The size of an electric force depends on the medium between the charges For Gravitational forces this makes no difference |
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