NBPhO/Est-Fin Problems and Solutions
Began in 2003 as an Estonian and Finnish competition, joined by Latvia in 2014 and Sweden in 2016, when it took its present name. Around twenty students per country sit a single exam.
All Mechanics Electromagnetism Thermodynamics Waves & Optics Modern & Quantum Relativity Astrophysics
Newest first Cards List
Kinematics Dynamics Rigid body Fluids Gravitation Statics Electrostatics Circuits Magnetostatics Induction Heat transfer Gas laws Kinetic theory Phase transitions Oscillations Wave propagation Interference Geometrical optics Atomic Nuclear Particle Quantum mechanics Stellar Orbital mechanics Observational
2026
Estonia
1 Moving lens Problem Solution NBPhO 2026 problem 1, Moving lens 2 Lissajous bridge Problem Solution NBPhO 2026 problem 2, Lissajous bridge 3 Kirill on a swing Problem Solution NBPhO 2026 problem 3, Kirill on a swing 4 Rod and bead Problem Solution NBPhO 2026 problem 4, Rod and bead 5 Saturation pressure of water Problem Solution NBPhO 2026 problem 5, Saturation pressure of water 6 Pull-up bar rope Problem Solution NBPhO 2026 problem 6, Pull-up bar rope 7 Water hose Problem Solution NBPhO 2026 problem 7, Water hose 8 Jet sound Problem Solution NBPhO 2026 problem 8, Jet sound 9 CO2 fire extinguisher Problem Solution NBPhO 2026 problem 9, CO2 fire extinguisher 10 Ball magnet Problem Solution NBPhO 2026 problem 10, Ball magnet
2025
Estonia
1 Flying dumbbell not published 2 Evaporation not published 3 Nuclear reactors not published 4 Black box not published 5 Throwing not published 6 Birds not published 7 Charged rod not published 8 Phase spiral not published 9 Hot plate not published
2024
Estonia
1 Four charges not published 2 Oklo fission reactor not published 3 Sticky ball not published 4 Totality not published 5 String and pendulum not published 6 Cones not published 7 Waves not published 8 Airplanes not published 9 Triangle not published 10 Kitchen physics not published
2023
Estonia
1 Curling not published 2 Nitrogen explosion not published 3 Wobble not published 4 Black box not published 5 Force sensor not published 6 String-coupled masses not published 7 A stack of papers not published 8 Connected charges not published 9 Surface tension not published
2022
Estonia
1 Escape not published 2 Gas not published 3 Rocket not published 4 AC filter not published 5 Ferromagnetic stripe not published 6 Life hacks not published 7 Electrons in magnetic field not published 8 Brightness of planets not published 9 Magnet in glass not published
Problems 10 problems
1 Dragon Problem Solution NBPhO 2017 problem 1, Dragon 2 Comet Problem Solution NBPhO 2017 problem 2, Comet 3 Resistors and Capacitors Problem Solution NBPhO 2017 problem 3, Resistors and Capacitors 4 Gravitational Waves Problem Solution NBPhO 2017 problem 4, Gravitational Waves 5 Virtual Mass Problem Solution NBPhO 2017 problem 5, Virtual Mass 6 Loop Problem Solution NBPhO 2017 problem 6, Loop 7 Zener Problem Solution NBPhO 2017 problem 7, Zener 8 Beams Problem Solution NBPhO 2017 problem 8, Beams 9 Spacecraft Pressure Problem Solution NBPhO 2017 problem 9, Spacecraft Pressure 10 Black Box Problem Solution NBPhO 2017 problem 10, Black Box
Problems 10 problems
1 Fuel Consumption Problem Solution NBPhO 2016 problem 1, Fuel Consumption 2 Glass Plate Problem Solution NBPhO 2016 problem 2, Glass Plate 3 Music Problem Solution NBPhO 2016 problem 3, Music 4 Dimmer Problem Solution NBPhO 2016 problem 4, Dimmer 5 Candy-Wrapper Problem Solution NBPhO 2016 problem 5, Candy-Wrapper 6 Charge on a Ring Problem Solution NBPhO 2016 problem 6, Charge on a Ring 7 Helium Problem Solution NBPhO 2016 problem 7, Helium 8 Oscillations Problem Solution NBPhO 2016 problem 8, Oscillations 9 Deflection on Falling Problem Solution NBPhO 2016 problem 9, Deflection on Falling 10 Black Box Problem Solution NBPhO 2016 problem 10, Black Box
Problems 10 problems
1 Annihilation Problem Solution NBPhO 2015 problem 1, Annihilation 2 Holographic Lens Problem Solution NBPhO 2015 problem 2, Holographic Lens 3 Gear Shift Problem Solution NBPhO 2015 problem 3, Gear Shift 4 Star Wars Problem Solution NBPhO 2015 problem 4, Star Wars 5 Radiator Problem Solution NBPhO 2015 problem 5, Radiator 6 Two Balls Problem Solution NBPhO 2015 problem 6, Two Balls 7 Bouncy Ball Problem Solution NBPhO 2015 problem 7, Bouncy Ball 8 Electric Field Problem Solution NBPhO 2015 problem 8, Electric Field 9 Solenoids Problem Solution NBPhO 2015 problem 9, Solenoids 10 Vapour Pressure Problem Solution NBPhO 2015 problem 10, Vapour Pressure
Problems 10 problems
1 DC-DC Converter Problem Solution NBPhO 2014 problem 1, DC-DC Converter 2 Waste Project Problem Solution NBPhO 2014 problem 2, Waste Project 3 Magnets Problem Solution NBPhO 2014 problem 3, Magnets 4 Superballs Problem Solution NBPhO 2014 problem 4, Superballs 5 Planck's Constant Problem Solution NBPhO 2014 problem 5, Planck's Constant 6 Running on Ice Problem Solution NBPhO 2014 problem 6, Running on Ice 7 Spin System Problem Solution NBPhO 2014 problem 7, Spin System 8 Mirror Interference Problem Solution NBPhO 2014 problem 8, Mirror Interference 9 Thermal Acceleration Problem Solution NBPhO 2014 problem 9, Thermal Acceleration 10 Young's Modulus of Rubber Problem Solution NBPhO 2014 problem 10, Young's Modulus of Rubber
Problems 10 problems
1 Prism Problem Solution NBPhO 2013 problem 1, Prism 2 Cellphone Camera Problem Solution NBPhO 2013 problem 2, Cellphone Camera 3 Mission to Mars Problem Solution NBPhO 2013 problem 3, Mission to Mars 4 Magnetic Dipoles Problem Solution NBPhO 2013 problem 4, Magnetic Dipoles 5 Friction of a String Problem Solution NBPhO 2013 problem 5, Friction of a String 6 Sphere and Cylinder Problem Solution NBPhO 2013 problem 6, Sphere and Cylinder 7 Burning with a Lens Problem Solution NBPhO 2013 problem 7, Burning with a Lens 8 Zener Diode Problem Solution NBPhO 2013 problem 8, Zener Diode 9 Glass Cylinder Problem Solution NBPhO 2013 problem 9, Glass Cylinder 10 Resistive Heating Problem Solution NBPhO 2013 problem 10, Resistive Heating
Problems 10 problems
1 Asteroid Problem Solution NBPhO 2012 problem 1, Asteroid 2 Thermodynamic Cycle Problem Solution NBPhO 2012 problem 2, Thermodynamic Cycle 3 Bars and Rod Problem Solution NBPhO 2012 problem 3, Bars and Rod 4 RLC-circuit Problem Solution NBPhO 2012 problem 4, RLC-circuit 5 Diffraction Grating Problem Solution NBPhO 2012 problem 5, Diffraction Grating 6 Uranium Decay Problem Solution NBPhO 2012 problem 6, Uranium Decay 7 Lifting by Current Problem Solution NBPhO 2012 problem 7, Lifting by Current 8 Elastic Collision Problem Solution NBPhO 2012 problem 8, Elastic Collision 9 Power Lines Problem Solution NBPhO 2012 problem 9, Power Lines 10 Black Box Problem Solution NBPhO 2012 problem 10, Black Box
Problems 11 problems
1 Charges in E Problem Solution NBPhO 2010 problem 1, Charges in E 2 Thermos Bottle Problem Solution NBPhO 2010 problem 2, Thermos Bottle 3 Tyrannosaur (T. Rex) Problem Solution NBPhO 2010 problem 3, Tyrannosaur (T. Rex) 4 Ball Problem Solution NBPhO 2010 problem 4, Ball 5 Elastic thread Problem Solution NBPhO 2010 problem 5, Elastic thread 6 Charges in B Problem Solution NBPhO 2010 problem 6, Charges in B 7 Satellite Problem Solution NBPhO 2010 problem 7, Satellite 8 Sprinkler Problem Solution NBPhO 2010 problem 8, Sprinkler 9 Power Supply Problem Solution NBPhO 2010 problem 9, Power Supply 10 Ice-rally Problem Solution NBPhO 2010 problem 10, Ice-rally 11 Black Box Problem Solution NBPhO 2010 problem 11, Black Box
Problems 10 problems
1 Boat Problem Solution NBPhO 2009 problem 1, Boat 2 Nanoclock Problem Solution NBPhO 2009 problem 2, Nanoclock 3 Ball Problem Solution NBPhO 2009 problem 3, Ball 4 Black Box Problem Solution NBPhO 2009 problem 4, Black Box 5 Pencil Problem Solution NBPhO 2009 problem 5, Pencil 6 Spring Problem Solution NBPhO 2009 problem 6, Spring 7 Soap Film Problem Solution NBPhO 2009 problem 7, Soap Film 8 Magnetic pulse Problem Solution NBPhO 2009 problem 8, Magnetic pulse 9 Stratostat Problem Solution NBPhO 2009 problem 9, Stratostat 10 Wedge Problem Solution NBPhO 2009 problem 10, Wedge
Problems 10 problems
1 Dumbbell Problem Solution NBPhO 2008 problem 1, Dumbbell 2 Microcalorimeter Problem Solution NBPhO 2008 problem 2, Microcalorimeter 3 Tractor Problem Solution NBPhO 2008 problem 3, Tractor 4 Magnetic Field Problem Solution NBPhO 2008 problem 4, Magnetic Field 5 Ball Problem Solution NBPhO 2008 problem 5, Ball 6 Rectifier Problem Solution NBPhO 2008 problem 6, Rectifier 7 Fire Problem Solution NBPhO 2008 problem 7, Fire 8 Electron Problem Solution NBPhO 2008 problem 8, Electron 9 Asteroid Problem Solution NBPhO 2008 problem 9, Asteroid 10 Glass plate Problem Solution NBPhO 2008 problem 10, Glass plate
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