"What? What are you asking me?"
"Place an insulating dielectric ball (permittivity ε) with free charge density ρf in the uniform external electric field Eo, and find the electric potential at each point in space."
"Ahhhhhhhhhhh why do you still have to study physics and become an immortal after traveling through time!!!!"
The sweaty bald girl woke up from her dream, "Fortunately, it was just a dream." Before she could finish her words, a long sword passed through her chest, "Young girl, you must die!!"
"Here we go again. This has happened so many times. Let me go back to study physics!! The motherland needs talents like me."
Okay, I'll let you go when you become an immortal.
To put it simply, this is the story of a bald physics girl who travels through time to cultivate immortality. Unfortunately, she is not the protagonist. She has no adventures or golden fingers. She is just a little more unlucky than others.