Understanding Displacement Vector and Plane Waves

This lecture covers the concept of the displacement vector D, which is directly determined by free charges and plays a crucial role in calculating the electric field E. The instructor addresses questions related to exercise 6 on sheet 9, focusing on the direction of induced current in specific scenarios. Additionally, the lecture delves into the topic of plane waves, explaining their definition and when to use their expression over normal waves. The session also touches on the significance of the magnetic vector potential, emphasizing its role in finding the magnetic field that satisfies Maxwell's equations. Various questions from students regarding these fundamental concepts are addressed throughout the lecture.