A collection of physics practice problems I’ve put together (advanced level). Each set is an interactive answer-check page: click any sub-question to reveal its answer, click “Show all answers” at the top to expand the whole set at once, and formulas are rendered with MathJax.
⚡ Electromagnetism Comprehensive Practice (Advanced)
Multi-step, cross-topic comprehensive problems, close to the final challenge questions of the college entrance exam / an introduction to competition level. Covers parallel-plate capacitors, motion of charged particles in electromagnetic fields, LC oscillation, electromagnetic induction (rail models), bounded-magnetic-field geometry, and more — including a beyond-syllabus “magnetic field + gravity” challenge.
👉 Open: Electromagnetism Comprehensive Practice · Answer Check
🧲 Electromagnetism · Relationships Among Physical Quantities
One notch harder than the previous set, focusing on the relationships and mutual constraints among the physical quantities in electric and magnetic fields (which determines which, which is clamped by which, which is directly/inversely proportional), introducing classic instruments such as the velocity selector, mass spectrometer, and cyclotron.
👉 Open: Electromagnetism Relationships Practice · Answer Check
How to use: work through the problems on your own first; when stuck, click the corresponding sub-question for a quick peek at the answer; once done, use “Show all answers” to check every question at once.