Electric Fields Flashcards
What is electric charge measured in?
Coulombs
What happens if a charged object is placed in an electric field?
It will experience a force
What is Coulomb’s law?
The magnitude of the force, F, between two electrically charged bodies which are small compared to their separation is inversely portional to the square of the distance between them and proportional to the product of their charges.
What is true about the forces on a charges in an electric field?
The force on one is equal and opposite to the force on the other
What is true if the charges are not in a vacuum?
The size of the force will also depend on the permittivity of, e, the material between them
What is the electrical field strength?
It is the electrical force per unit positive charge
What direction will be electric field point in?
It will point in the direction that a positive charge would move
What happened to the electric fields if the field is radial, point charges?
They point away from the charge if it is positive and towards it if it is negative
For parallel plates, how are field lines drawn?
The lines point from the plate with a more positive voltage to the point with the less positive voltage.
What kind of law occurs for the electric field strength, when the field is radial?
An inverse square law, the field strength decreases the further away from the charge
How can a uniform field be created??
By connecting two parallel plates to the opposite poles of the battery, when this occurs the electric field strength is the same for all points.
What is electrical potential?
The electrical potential energy that a unit positive charge would have at that point or the work done per unit charge gained by a small positive charge brought from infinity to that point
When is the absolute magnitude of electric potential greatest?
On the surface of the charge.
What is electrical potential difference?
The energy needed to move a unit charge from one point to another
What does the amount of energy in moving a unit charge depend on?
The size of the charge you’re moving and the size of the potential difference you want to move it across
