Which of the following particle pairs has the largest magnitude of the ratio
gravitational forceelectrostatic force \frac{\text{gravitational force}}{\text{electrostatic force}} electrostatic forcegravitational forcewhen they are separated by a given distance?
a proton and an electron
a proton and a positive pion
two helium nuclei (alpha particles)
an electron and a positive pion
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.