Which of the following pairs of particles, when separated by a constant distance, has the largest magnitude of the ratio
gravitational forceelectrostatic force \frac{\text{gravitational force}}{\text{electrostatic force}} electrostatic forcegravitational forcea proton and an electron
two protons
a helium-4 nucleus and a proton
a positive pion and an electron
50 exam-style questions on AQA A Level Physics Particles, covering Constituents of the atom, Stable and unstable nuclei, Particles, antiparticles and photons, Particle interactions, Classification of particles, Quarks and antiquarks, and Applications of conservation laws. Each one has a worked solution and a mark scheme showing where the marks go.