Kevin Zhou — USAPhO Practice — E&M Problem 3 · Kevin Zhou #USAPhOE.3
Physics · electromagnetism
Problem
Suppose the conducting loop described above has a resistance of 50 Ohms. Inside the cabinet
there is a solid state device that can survive a maximum current of 0.25 A. Could this device
be damaged by the lightning strike described in part 2?
Question A2
A large vessel is filled with an incompressible, electrically insulating liquid of mass density ρ ,
m
carrying a uniform charge density ρ , which is so small that any electric fields created by the liquid
e
can be neglected. Let z = 0 at the initial surface level of the liquid. A point charge −q is brought
to the height H, and a bump forms on the liquid surface.