Much like in the electricity portion right before introducing Gausss Law, there is a difficult brute force method of finding the influence of the magnetic field at a point due to a current-carrying wire. Also like in the electricity portion, there is a much easier law to use for solving problems like these, which will be taught in the next video. Nevertheless, this law is important in the world of magnetism, and it never hurts to know it. Because this is a rather difficult method to understand, if asked to do a problem using this law on an exam, you can always refer to Amperes Law as a way of checking your work once you have an answer.
A small section of current-carrying wire will create a small magnetic field. If you add up all the little bits of magnetic field created by all the small sections of wire, you will obtain the total magnetic field at a given point. The Biot-Savart Law provides you a method of calculating the magnetic field due to that small section of current-carrying wire.
Symmetry arguments can be extremely useful in simplifying calculations using the Biot-Savart Law.
The dl vector is a vector pointing in the direction of positive current flow for a differentially small section of wire.
The r vector is a vector pointing in the direction from dl to the point of interest.
The Biot-Savart Law
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.