AP Physics C: Electricity and Magnetism Flashcards: Electric Fields
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
What is the definition of the electric field at a given point?
The electric field at a point is the ratio of the electric force exerted on a test charge at that point to the charge of the test charge.
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What is the definition of the electric field at a given point?
The electric field at a point is the ratio of the electric force exerted on a test charge at that point to the charge of the test charge.
What is meant by the term 'electrostatic equilibrium' for a conductor?
This is a state where the excess charge on a conductor is no longer moving, resulting in the electric field within the conductor being zero.
What is the equation for the electric field?
The equation for the electric field is $\vec{E}=\frac{\vec{F_{E}}}{q}$, where $\vec{F_{E}}$ is the electric force and q is the test charge.
A test charge 'q' is placed at a point where the electric field is $\vec{E}$. What is the electric force, $\vec{F_{E}}$, on the test charge?
The electric force on the charge is $\vec{F_{E}} = q\vec{E}$, which is a rearrangement of the electric field definition.
Where is the excess charge located on a conductor in electrostatic equilibrium?
In electrostatic equilibrium, the excess charge of a conductor is distributed entirely on the surface of the conductor.
A solid, charged conducting sphere is in electrostatic equilibrium. What is the magnitude of the electric field at the geometric center of the sphere?
The electric field at the center is zero, because the electric field is zero everywhere within a conductor in electrostatic equilibrium.
How is the net electric field determined when multiple charged objects are present?
The net electric field at a given location is the vector sum of the individual electric fields created by each of the nearby charged objects.
What is the electric field within a conductor in electrostatic equilibrium?
While a conductor is in electrostatic equilibrium, the electric field within the conductor is zero.
What principle is used to describe the electric field produced by a configuration of multiple point charges?
The principle of superposition is used, which states the net field is the vector sum of the individual fields from each point charge.
How do electric fields from charged conductors and insulators differ in terms of charge distribution?
For a charged conductor in equilibrium, excess charge resides on the surface, while for an insulator, charge can be distributed throughout its volume.