There are several excellent books on Classical Field Theory that are suitable for advanced undergraduate physicists. Here are a few recommendations:
"Classical Field Theory" by Davison E. Soper: This book provides a comprehensive introduction to classical field theory, covering topics such as the classical mechanics of particles and fields, Lagrangian and Hamiltonian formalisms, gauge theory, and the classical field theory of electromagnetism. It is written in a clear and accessible style, making it suitable for advanced undergraduates.
"Classical Field Theory: Electromagnetism and Gravitation" by Francis E. Low: This book focuses on the classical field theory of electromagnetism and gravitation. It provides a rigorous treatment of the subject, including the mathematical foundations and principles of classical field theory. It is more mathematically advanced than some other texts but is still accessible to advanced undergraduates.
"Field Theory: A Modern Primer" by Pierre Ramond: This book provides a modern introduction to classical field theory, with a particular emphasis on quantum field theory. It covers topics such as classical mechanics, classical field theory, symmetries, and conservation laws. While it is more oriented towards graduate students, advanced undergraduates with a strong background in physics and mathematics will find it valuable.
"An Introduction to Classical Field Theory" by Leonardo Mazzoni: This book offers a concise introduction to classical field theory, covering topics such as Lagrangian and Hamiltonian formalisms, symmetries, conservation laws, and the classical field theory of electromagnetism. It is written in a pedagogical style, making it suitable for advanced undergraduates.
"Classical Field Theory" by Florian Scheck: This book provides a comprehensive and modern treatment of classical field theory. It covers a wide range of topics, including the mathematical foundations, Lagrangian and Hamiltonian formalisms, symmetries, and conservation laws. It is mathematically rigorous but still accessible to advanced undergraduates.
These books should provide you with a solid foundation in Classical Field Theory and serve as valuable resources for advanced undergraduate physicists. Remember to choose the one that aligns with your mathematical and conceptual background and preferences.