Stepping away from mathematical modelling and into some concepts of E&M, we learn about electric fields inside and outside a charged object. Using a sphere as our object, the electrons inside the sphere will congregate as far from the center as possible, and will cause the outside of the sphere to hold all of the charge. You may use superposition to solve or take this as fact, but the electric field at any point inside our sphere is zero. Outside of the sphere there is an electric field. Using Gausss Law, you can see how the charge inside the charged sphere is zero because the electric field inside is also zero. Likewise, hollow objects (for example, a hollow sphere) have a zero electric field inside as well. Since the electric field is zero inside, the charge inside is also zero. Next well move on to how we hold a charge.
At electrostatic equilibrium, there are no moving charges in a conductor, therefore there is no net force, and the electric field inside the conductor must be zero.
All excess charge on a conductor lies on the surface of the conductor.
The electric field on the surface of a conductor must be perpendicular to the surface.
The electric field inside any hollow conductor is zero (assuming there are no charges in the hollow region). This allows hollow conductors to be utilized to isolate regions completely from electric fields. In this configuration, the hollow conductor is known as a Faraday Cage.
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.
This book includes a comprehensive review of the key AP Physics C concepts and targeted strategies for acing every section of the exam. Additionally, the book includes two full length practice tests with full answer explanations.
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 2 full length practice exams modeled on the real test, 3 separate plans to fit your study stle, review material updated to the most recent tests, and all the terms and concepts you need to know.