Where theres a magnetic field theres a magnetic force. Previously, we learned how current-carrying wires have a magnetic force exerted by them, but that also means they have a magnetic field. Also like the previous video, youll need to use the RHR to find out which direction the magnetic field travels. If we were to look at two wires, depending on their currents direction the wires will either attract or repel each other. Another important point in this section is Gausss Law for magnetism (which will be just as useful as his law for electricity). Its important to know what it is, but also to know why it works, and that is due to the lack of magnetic monopoles in the physical world. As with most topics in physics, knowing the math is good, but understanding why it is, is just as important.
Moving charges (including electrical currents) create magnetic fields.
Magnetic fields exert forces on moving charges (including electrical currents).
Right-hand rules allow you to determine the direction of forces and fields due to magnetic interactions.
The force on a current-carrying wire in a magnetic field is given by: F=ILBsinθ.
The magnetic field due to a current-carrying wire is given by: B=µ0*I/(2πr).
A coil of wire known as a solenoid can be used to create an electromagnet. Placing an iron core inside a solenoid greatly strengthens the electromagnet.
Current-carrying parallel wires with current in the same direction attract each other; if the current flows in opposite directions they repel each other.
Magnetic Fields Due to Current-Carrying Wires
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.