THE CONCEPT COLLECTION
Unpack the concept. Follow the reasoning. Then try it for yourself. A growing reading library for your JEE, NEET, SAT, GRE, GMAT and UPSC common-core preparation.
489 complete lessons currently available. Each lesson identifies its exact topics within the reviewed analytics or declared teaching framework. Selected past-exam questions and original practice are labeled separately. These notes support learning; they are not complete exam preparation or a claim of current-syllabus coverage.
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35 available lessons shown
Alternating Current
Make phase visible, distinguish driven resonance from free oscillation, and follow transformer power.
Atoms
Use scattering to locate the nucleus and energy differences to decode atomic spectra.
Electrostatic Potential and Capacitance
Start with what is held fixed. Then let charge, field and energy tell one consistent story.
Centre of Mass and Collisions
Track systems, impulses and relative motion through collisions without confusing energy conservation.
Current Electricity
Conservation at nodes and loops, then one careful initial condition for every capacitor.
Communication Systems
Follow a message from source to receiver and derive AM envelopes, sidebands and detection conditions.
Units and Measurements
Measure honestly: units, dimensions, uncertainty and instruments tell different parts of the story.
Mechanical Properties of Solids
Separate loading, material response and geometry to analyse elastic deformation and stored energy.
Electromagnetic Induction
Track changing flux, follow Lenz’s direction, and account for the energy in inductive circuits.
Electromagnetic Waves
Connect Maxwell’s correction, transverse fields and energy transport in a clear vacuum-wave model.
Electric Charges and Fields
From individual charges to symmetry: calculate fields, interpret flux and predict motion.
Electrostatic Potential and Capacitance
Use scalar potentials, spatial gradients and signed energy changes to simplify electrostatics.
Mechanical Properties of Fluids
Build pressure balances, buoyancy models and flow-energy equations with their assumptions visible.
Thermodynamics
Follow the energy, identify the path, then ask whether the second law permits it.
Gravitation
Connect spherical fields, gravitational energy and orbital geometry without mixing their approximations.
Thermal Properties of Matter
Build complete energy balances, decide the final phase and separate free from constrained expansion.
Thermal Properties of Matter
Connect conduction networks, cooling transients and radiative exchange through one energy balance.
Wave Optics
Phase, aperture and polarization: three distinct ways a light pattern carries information.
Kinetic Theory of Gases
Link gas laws to random molecular motion, speed distributions and active energy modes.
Moving Charges and Magnetism
Use cross products, current geometry and dipole moments to connect magnetic fields with forces.
Magnetism and Matter
Distinguish weak responses, magnetic domains and hysteresis without treating permeability as universal.
Laws of Motion
Draw interactions first, then test the contact regime: Newton’s laws, friction and circular dynamics.
Nuclei
Connect mass deficits, reaction energy and statistical decay with explicit model assumptions.
Dual Nature of Radiation and Matter
Separate energy per photon, photon arrival rate and particle momentum to make duality problems predictable.
Current Electricity
Connect moving-coil physics to practical meter loading, bridge ratios and null measurements.
Motion in a Straight Line
One clock, clear axes and honest graphs: connect straight-line motion, projectiles and moving observers.
Ray Optics
Draw the geometry, declare the signs, then connect refraction and imaging to real optical instruments.
Current Electricity
Follow charge from microscopic drift to resistance, networks and electrical heating.
Semiconductor Electronics
From carriers and junctions to rectifiers, regulators, amplifiers and logic: always check the operating region.
Oscillations
Track phase, energy and restoring forces, then see how damping and driving alter the motion.
Waves
Follow the travelling phase, then let boundaries select standing waves and moving observers shift sound.
Mechanical Properties of Fluids
Count interfaces, track curvature and choose the right viscous-flow model.
Rotational Motion
Choose an axis, identify the constraint and let torque, energy and angular momentum play their distinct roles.
Mathematical Tools and Vectors
Use components and geometry to choose the right vector operation before doing the algebra.
Work Energy and Power
Use force–displacement geometry, potential graphs and power balances to solve motion cleanly.
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