Chapter 19 - Electric Potential Energy and the Electric Potential Flashcards
Explain the work done by an electric force.
When a positive test charge +q0 moves from point A to point B in the presence of an electric field, work WAB is done by the electric force.The work equals the electric potential energy (EPE) at A minus that at B
Does the path a test charge moves matter?
The electric force is a conservative force, so the path along which the test charge moves from A to B is of no consequence, for the work WAB is the same for all paths.
What is the SI unit of electric potential?
J/C = V
How do positive and negative charges accelerate?
A positive charge accelerates from a region of higher potential toward a region of lower potential. Conversely, a negative charge accelerates from a region of lower potential toward a region of higher potential.
What is an equipotential surface?
An equipotential surface is a surface on which the electric potential is the same everywhere.
Why does the electric force do no work when a charge moves on an equipotential surface?
The electric force does no work as a charge moves on an equipotential surface, because the force is always perpendicular to the displacement of the charge.
What is a capacitor?
A capacitor is a device that stores charge and energy. It consists of two conductors or plates that are near one another, but not touching.
What is the SI unit for capacitance?
C/V = F
What is a dielectric?
The insulating material included between the plates of a capacitor is called a dielectric.
