Kevin Zhou — USAPhO Practice A Problem 4 · Kevin Zhou #USAPhOA.4
Physics · mechanics
Problem
Thequantityτ shouldbedeterminedbytheconductivityσ oftheplate. Findaroughestimate
for the power dissipated by the point charge in the metal, in terms of q, σ, v, and r.
2
Kevin Zhou Physics Olympiad Handouts
Question A3
A particle of mass m and charge q is in a homogeneous magnetic field Bzˆ. The system is situated
in between two parallel electrodes, which can be used to create a homogeneous electric field Exˆ.
Throughout this problem, neglect any radiation or induction effects.