The Gravity of Being Charged or Neutral

Harvard Astronomy graduate students are preparing for a challenging general exam covering various astrophysics topics. To help boost their confidence, the instructor shared a complex question about charged particles, gravity, and the Equivalence Principle. The question explores how electromagnetic radiation from accelerated charged particles might appear to contradict the principle that all objects fall at the same rate under gravity. The resolution involves considering the entire system, including electromagnetic fields, rather than just the particle itself. This demonstrates the importance of a comprehensive approach when applying physical principles.