TwPhO TST Problems and Solutions

Taiwan's selection for the IPhO team, run in two written rounds. Around 3,500 students sit the first; some 300 go through to the second, from which about 30 are chosen. Archived here is the second round.

2026

Taiwan

Problems6 problemsProblemsSolutions
  • 1Problem 1not published
  • 2Problem 2not published
  • 3Problem 3not published
  • 4Problem 4not published
  • 5Problem 5not published
  • 6Problem 6not published

2025

Taiwan

Problems6 problemsProblemsSolutions
  • 1Two-body scattering deflection*not published
  • 2Inclined plane with oscillating mass*not published
  • 3Charged rod and capacitor oscillations*not published
  • 4Inductance of two parallel wires*not published
  • 5Fin rod temperature profile*not published
  • 6Acousto-optic grating diffraction*not published

2024

Taiwan

Problems6 problemsProblemsSolutions
  • 1Projectile from rotating platform*not published
  • 2Two charged particles motion*not published
  • 3Atmospheric lapse rate*not published
  • 4Interference in thin plate*not published
  • 5Rotating rod with friction*not published
  • 6Charged particle in magnetic field*not published

2023

Taiwan

Problems6 problemsProblemsSolutions
  • 1Problem 1not published
  • 2Rocket with air resistance*not published
  • 3Gas process ratios and work*not published
  • 4Ion pump and elastic membrane*not published
  • 5Image charges in wedge*not published
  • 6Vibrating rod with attached masses*not published

2022

Taiwan

Problems6 problemsProblemsSolutions
  • 1Relativistic perihelion precession*not published
  • 2Charged line and conducting cylinder*not published
  • 3RLC circuit with varying capacitance*not published
  • 4Atmospheric lapse rate*not published
  • 5Falling loop in magnetic field*not published
  • 6Friction on a curved trajectory*not published

2021

Taiwan

Problems6 problemsProblemsSolutions
  • 1Rotating frame and pressure centers*not published
  • 2Rolling sphere on a track*not published
  • 3Damped em wave in conductor*not published
  • 4Ideal gas cyclic process*not published
  • 5Inductor resistance from decay*not published
  • 6Induced current heating a wire*not published

2020

Taiwan

Problems6 problemsProblemsSolutions
  • 1Otto and Atkinson cycle efficiency*not published
  • 2Interference fringes from thin plate*not published
  • 3Charges near dielectric interface*not published
  • 4Spinning ball collision with wall*not published
  • 5Charged ring in magnetic field*not published
  • 6Mechanical impedance of microphone*not published

2019

Taiwan

Problems6 problemsProblemsSolutions
  • 1Dry ice heat engine cycle*not published
  • 2Laser cavity resonances and pulses*not published
  • 3Electron flow between plates*not published
  • 4Falling rod with friction*not published
  • 5Charged particle in central field*not published
  • 6Lcr resonance and acoustic coupling*not published

2018

Taiwan

Problems6 problemsProblemsSolutions
  • 1Carnot engine with finite reservoirs*not published
  • 2Grating equation and resolution*not published
  • 3Charged particle in magnetic field*not published
  • 4Rolling ball collision with cushion*not published
  • 5Charged conducting sheet discharge*not published
  • 6Mutual inductance power transfer*not published

2017

Taiwan

Problems6 problemsProblemsSolutions
  • 1Two-chamber gas heating*not published
  • 2Generalized Snell's law with phase gradient*not published
  • 3Magnetic force resonance shift*not published
  • 4Sphere sliding to rolling*not published
  • 5Mutual inductance and induced currents*not published
  • 6Gunn oscillator circuit analysis*not published

2016

Taiwan

Problems6 problemsProblemsSolutions
  • 1Semicylinder rocking on table*not published
  • 2Two blocks with spring collision*not published
  • 3Charged particle in layered fields*not published
  • 4Poynting vector in cylinders*not published
  • 5Ray path in graded atmosphere*not published
  • 6Heat capacity of a solid*not published