The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.

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• Astronomy‏‎ (10 members)
• Atomic Physics‏‎ (2 members)
• Capacitance‏‎ (6 members)
• Circuits‏‎ (5 members)
• Color‏‎ (9 members)
• Diffraction and Interference‏‎ (12 members)
• Electric Fields and Potential‏‎ (9 members)
• Electricity and Magnetism‏‎ (82 members)
• Electromagnetic Radiation‏‎ (2 members)
• Electrostatics‏‎ (10 members)
• Energy‏‎ (5 members)
• Entropy and the Second Law‏‎ (4 members)
• Fluid Dynamics‏‎ (9 members)
• Fluid Mechanics‏‎ (24 members)
• Fluid Statics‏‎ (10 members)
• Geometrical Optics‏‎ (12 members)
• Gravitation‏‎ (2 members)
• Gravity‏‎ (6 members)
• Heat and the First Law‏‎ (5 members)
• Holography‏‎ (3 members)
• Hydraulics‏‎ (3 members)
• Ideal Gas Law‏‎ (18 members)
• Impulse and Linear Momentum‏‎ (6 members)
• Inductance‏‎ (10 members)
• Kinematics‏‎ (12 members)
• Kinetic Theory‏‎ (2 members)
• Light and Optics‏‎ (51 members)
• Magnetic Fields and Forces‏‎ (21 members)
• Magnetic Materials‏‎ (3 members)
• Measurement‏‎ (9 members)
• Mechanics‏‎ (88 members)
• Modern‏‎ (9 members)
• Newton's Laws‏‎ (18 members)
• Nuclear Physics‏‎ (3 members)
• OWS‏‎ (49 members)
• Observation‏‎ (5 members)
• Oscillations‏‎ (16 members)
• Outreach‏‎ (3 members)
• Phosphorescence and Fluorescence‏‎ (2 members)
• Planetary Models‏‎ (3 members)
• Polarization‏‎ (3 members)
• Quantum Physics‏‎ (4 members)
• Refraction and Dispersion‏‎ (6 members)
• Relative Motion‏‎ (2 members)
• Resistance, EMF, and Current‏‎ (15 members)
• Rotational Dynamics‏‎ (21 members)
• Sound‏‎ (14 members)
• Spectral Lines‏‎ (6 members)
• Statics‏‎ (9 members)
• Superconduction‏‎ (1 member)

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