Electric charges produce an electric field that fills the space. To find the value of the electric field E at a point, we place a very small point charge q at that point and measure the
force F acting on the point charge; the electric field is then given by E = F / q. Note that the electric field is a vector, since F is a vector.
The electric field produced by a point charge Q at a distance r has a magnitude E = kQ/r^2. The field is directed radially outward if Q is positive and radially inward if Q is negative.
The electric field produced by a collection of point charges is equal to the vector sum of the fields produced by the individual point charges.
Between the plates of a charged parallel-plate capacitor, E = σ / ε0, where σ is the surface charge density on the plates and ε0 is the permittivity of free space.
Electric field lines are always tangent to the electric field at every point in space. The lines always begin at positive charge and end on negative charge, and their density is proportional
to the field strength.
Under electrostatic conditions, any excess charge, added to a conductor, must reside on the conductor surface.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book offers a complete review of your AP course, strategies to give you the edge on test day, and plenty of practice with AP-style test questions. It includes full length practice exams modeled on the real test and all the terms and concepts you need to know.
This book includes a review of all the topics tested including vectors, kinematics, fluid mechanics, optics and nuclear physics. Additionally, the book includes two full length tests made complete with descriptive solutions, and quick study tables for Physics B formulas and equations.