Physics

AC Circuits — Impedance, Resonance, Power Factor

Understand ac circuits from first principles with intuitive explanations and solved problems. AC circuits power the electricity in your home, the radio on your…

Alternating Current — AC Circuits, Resonance, Transformers

Alternating Current — AC Circuits, Resonance, Transformers Alternating current reverses direction periodically, unlike DC which flows one way.

Angular Momentum Conservation Problems

Angular Momentum Conservation Problems

Atoms — Concepts, Formulas & Solved Numericals

Complete guide to atoms for Class 12. Solved examples, exam tips, PYQs. Rutherford's gold foil experiment in 1909 shattered the 'plum pudding' model and gave…

Atwood Machines — All Variants

Atwood Machines — All Variants

Banked Roads and Friction

Banked Roads and Friction

Beats and Superposition of Waves

Beats and Superposition of Waves

Bernoulli Equation — When and How to Apply

Bernoulli Equation — When and How to Apply

Biot-Savart vs Ampere's Law — Which When

Biot-Savart vs Ampere's Law — Which When

Bohr's Model — How Electrons Orbit

Understand bohr's model from first principles with intuitive explanations and solved problems. By 1913, physicists were in trouble. Free guide on doubts.ai.

Buoyancy and Archimedes' Principle

Buoyancy and Archimedes' Principle

Calorimetry — Measuring Heat Transfer

Understand calorimetry from first principles with intuitive explanations and solved problems. Before we measure heat, we need to know what it is.

Capacitor Networks — Shortcut Tricks

Capacitor Networks — Shortcut Tricks

Capacitors — Storing and Releasing Charge

Understand capacitors from first principles with intuitive explanations and solved problems. A capacitor is the simplest device that stores electrical energy —…

Centre of Mass — Discrete and Continuous

Centre of Mass — Discrete and Continuous

Center of Mass — Finding the Balance Point

Understand center of mass from first principles with intuitive explanations and solved problems. Balance a ruler on your fingertip — the point where it…

Circular Motion — Why Things Move in Circles

Understand circular motion from first principles with intuitive explanations and solved problems. Newton's first law says an object moves in a straight line at…

Collisions — 1D vs 2D Approach

Collisions — 1D vs 2D Approach

Collisions and Momentum — Elastic, Inelastic, and Everything Between

Understand collisions and momentum from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Communication Systems — Modulation, Demodulation, Bandwidth

Communication Systems — Modulation, Demodulation, Bandwidth Communication systems transmit information (voice, data, video) from one place to another using…

Constraint Equations in Pulley Systems

Constraint Equations in Pulley Systems

Current Electricity — Ohm's Law, Kirchhoff's Laws, Circuits

Current Electricity — Ohm's Law, Kirchhoff's Laws, Circuits Current electricity is about charges in motion. This is a high-weightage chapter at every level.

de Broglie Wavelength — Worked Problems

de Broglie Wavelength — Worked Problems

Dimensional Analysis — Quick Verification

Dimensional Analysis — Quick Verification

Dimensional Analysis — Deriving and Checking Formulas

Understand dimensional analysis from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Dispersion through Prisms

Dispersion through Prisms

Doppler Effect — Why Pitch Changes

Understand doppler effect from first principles with intuitive explanations and solved problems. You've heard it: an ambulance approaches with a high-pitched…

Dual Nature Of Matter — Concepts, Formulas & Solved Numericals

Complete guide to dual nature of matter for Class 12. Solved examples, exam tips, PYQs. Light behaves like a wave — it diffracts, interferes, and shows…

Eddy Currents — Practical Applications

Eddy Currents — Practical Applications

Elasticity — Stress, Strain, and Young's Modulus

Understand elasticity from first principles with intuitive explanations and solved problems. Pull a rubber band and release it — it snaps back.

Electric Charges and Fields — Coulomb's Law, Field Lines, Gauss's Law

Electric Charges and Fields — Coulomb's Law, Field Lines, Gauss's Law This chapter is where Class 12 physics begins, and it sets the stage for everything in…

Electric Current And Its Effects — for Class 7

Complete guide to electric current and its effects for Class 7. NCERT solved examples and practice questions. Built for CBSE prep. Free guide on doubts.ai.

Electricity And Circuits — for Class 6

Complete guide to electricity and circuits for Class 6. NCERT solved examples and practice questions. Think about your morning. Built for CBSE prep.

Electromagnetic Induction — Faraday's Law, Lenz's Law, Inductance

Electromagnetic Induction — Faraday's Law, Lenz's Law, Inductance A changing magnetic flux through a circuit induces an EMF. Built for Class 12 prep.

Electromagnetic Waves — The Entire Spectrum

Understand electromagnetic waves from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Electrostatics — Coulomb's Law, Electric Field & Potential for Class 12

Coulomb's law, electric field lines, electric potential, capacitors, Gauss's law applications. NCERT Class 12 Chapter 1–2 with JEE-level examples.

Energy Conservation Shortcuts

Energy Conservation Shortcuts

Entropy and the Second Law — Made Simple

Entropy and the Second Law — Made Simple

Equipotential Surfaces and Field Lines

Equipotential Surfaces and Field Lines

Error Analysis in Physics Experiments

Error Analysis in Physics Experiments

Escape Velocity vs Orbital Velocity

Escape Velocity vs Orbital Velocity

Fluid Mechanics — Pressure, Buoyancy, and Flow

Understand fluid mechanics from first principles with intuitive explanations and solved problems. A fluid is any substance that can flow and takes the shape of…

Force And Pressure — for Class 8

Complete guide to force and pressure for Class 8. NCERT solved examples and practice questions. Every one of these actions involves force — and once you…

Free Body Diagrams — Mastery Guide

Free Body Diagrams — Mastery Guide

Friction — for Class 8

Complete guide to friction for Class 8. NCERT solved examples and practice questions. Push a book across the table. Built for CBSE prep. Built for CBSE prep.

Fun With Magnets — for Class 6

Complete guide to fun with magnets for Class 6. NCERT solved examples and practice questions. Pick up a magnet and hold it near an iron nail.

Gauss's Law — Choosing the Right Surface

Gauss's Law — Choosing the Right Surface

Gravitation — Universal Law, Orbital Mechanics, Satellites

Gravitation — Universal Law, Orbital Mechanics, Satellites Gravitation is the attractive force between any two masses in the universe. Free guide on doubts.ai.

Heat — Temperature, Conduction, Convection & Radiation for Class 7

Measuring temperature, conductors and insulators, transfer of heat by conduction, convection and radiation. NCERT Class 7 Science. Built for CBSE prep.

Heat Engines, Efficiency and COP

Heat Engines, Efficiency and COP

Heat Transfer — Conduction, Convection, Radiation

Understand heat transfer from first principles with intuitive explanations and solved problems. Heat always flows from a hotter body to a cooler one — never…

How to Draw Free Body Diagrams — A Step-by-Step Method

Understand how to draw free body diagrams from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Hydrogen Spectrum — Lyman, Balmer, Paschen

Hydrogen Spectrum — Lyman, Balmer, Paschen

Interference and Diffraction — When Waves Overlap

Understand interference and diffraction from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Kepler's Laws — Application Problems

Kepler's Laws — Application Problems

Kinematics — Motion in One & Two Dimensions

Kinematics from scratch: equations of motion, projectile motion, relative velocity. CBSE, JEE solved numericals. Built for JEE & CBSE prep.

Kinetic Theory of Gases — Ideal Gas, Maxwell Distribution, Mean Free Path

Kinetic Theory of Gases — Ideal Gas, Maxwell Distribution, Mean Free Path Kinetic theory connects the microscopic world (random molecular motion) to…

Kirchhoff's Laws — Systematic Approach

Kirchhoff's Laws — Systematic Approach

Ladder Problems in Statics

Ladder Problems in Statics

LC Oscillations — Energy Exchange

LC Oscillations — Energy Exchange

Lens and Mirror Formulas — Sign Conventions

Lens and Mirror Formulas — Sign Conventions

Light — Class 8

Light — Class 8

Light, Shadows and Reflections — Complete Guide for Class 6

Sources of light, transparent/translucent/opaque objects, shadow formation, mirrors and reflections. NCERT Class 6 Science. Built for CBSE prep.

Light — for Class 7-8

Complete guide to light for Class 7, Class 8. NCERT solved examples and practice questions. Light is something we rarely think about — until we close our eyes…

Logic Gates — Truth Tables and Combinations

Logic Gates — Truth Tables and Combinations

Magnetism — Concepts, Formulas & Solved Numericals

Complete guide to magnetism for Class 12. Solved examples, exam tips, PYQs. Magnetism shows up everywhere in Class 12 — from the force on a current-carrying…

Magnetic Effects of Current — Oersted to Ampere

Understand magnetic effects of current from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Microscopes and Telescopes — Magnification

Microscopes and Telescopes — Magnification

Modern Physics — Concepts, Formulas & Solved Numericals

Complete guide to modern physics for Class 12. Solved examples, exam tips, PYQs. Modern physics is everything that came after classical mechanics broke down in…

Moment of Inertia — Shortcuts and Theorems

Moment of Inertia — Shortcuts and Theorems

Motion And Measurement — for Class 6

Complete guide to motion and measurement for Class 6. NCERT solved examples and practice questions. Every time you throw a cricket ball, ride your bicycle, or…

Motion And Time — for Class 7

Complete guide to motion and time for Class 7. NCERT solved examples and practice questions. Every moving thing around us — a cricket ball after a sixer, an…

Newton's Laws of Motion — Concepts, Numericals & Exam Tips

Complete guide to Newton's three laws. Free body diagrams, friction, tension for CBSE, JEE, NEET. Newton's Laws of Motion carry serious weightage in every…

Nuclear Binding Energy Curve — Reading It

Nuclear Binding Energy Curve — Reading It

Nuclei — Concepts, Formulas & Solved Numericals

Complete guide to nuclei for Class 12. Solved examples, exam tips, PYQs. The nucleus sits at the heart of every atom, occupying roughly m — about the size of…

Light — Reflection and Refraction, Lenses & Mirrors (Class 10)

Laws of reflection and refraction, spherical mirrors, lenses, refractive index, power of lens, human eye defects. NCERT Class 10 Chapter 10.

Organ Pipes — Open vs Closed Resonance

Organ Pipes — Open vs Closed Resonance

Oscillations — SHM, Energy & Pendulum for Class 11

Simple harmonic motion, restoring force, amplitude, time period, frequency, energy in SHM, simple pendulum, spring-mass system. NCERT Class 11 Chapter 14.

Parallax Method — Astronomical Distances

Parallax Method — Astronomical Distances

Photoelectric Effect — The Experiment That Changed Physics

Understand photoelectric effect from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Physics in Everyday Life — From Cars to Cooking

Understand physics in everyday life from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Physics Problem Solving — Strategies That Actually Work

Understand physics problem solving from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Polarization of Light — Brewster's Law

Polarization of Light — Brewster's Law

Projectile Motion — From Basics to Tricky Problems

Understand projectile motion from first principles with intuitive explanations and solved problems. When you throw a ball at an angle, it follows a curved path…

Pseudo Forces in Non-Inertial Frames

Pseudo Forces in Non-Inertial Frames

Radioactive Decay Laws — Half-Life Problems

Radioactive Decay Laws — Half-Life Problems

Radioactivity — Alpha, Beta, Gamma and Half-Life

Understand radioactivity from first principles with intuitive explanations and solved problems. Radioactivity is the spontaneous disintegration of an unstable…

Ray Optics — Concepts, Formulas & Solved Numericals

Complete guide to ray optics for Class 12. Solved examples, exam tips, PYQs. Light travels in straight lines. Built for JEE & NEET & CBSE prep.

RC and LR Circuits — Transient Behaviour

RC and LR Circuits — Transient Behaviour, growth and decay equations, time constants, JEE/NEET solved examples

Reading Kinematics Graphs Correctly

Reading Kinematics Graphs Correctly

Rectifiers — Half Wave vs Full Wave

Rectifiers — Half Wave vs Full Wave

Relative Motion — When to Use Which Frame

Relative Motion — When to Use Which Frame

RMS, Mean and Most-Probable Speeds

RMS, Mean and Most-Probable Speeds

Rolling Without Slipping — Conditions

Rolling Without Slipping — Conditions

Rotational Motion — Concepts, Formulas & Solved Numericals

Complete guide to rotational motion for Class 11. Solved examples, exam tips, PYQs. When a cricket ball spins in the air or a spinning top refuses to fall…

Self and Mutual Inductance

Self and Mutual Inductance — Class 12 complete guide with formulas, derivations, and JEE/NEET examples

Semiconductor Electronics — p-n Junction, Diode, Transistor, Logic Gates

Semiconductor Electronics — p-n Junction, Diode, Transistor, Logic Gates Semiconductors are materials with conductivity between metals and insulators.

Significant Figures and Error Analysis

Understand significant figures and error analysis from first principles with intuitive explanations and solved problems. No measuring instrument is perfect.

Significant Figures — All Rules

Significant Figures — All Rules

Simple Harmonic Motion — Springs, Pendulums, and Beyond

Understand simple harmonic motion from first principles with intuitive explanations and solved problems. Built for JEE & NEET & CBSE prep.

Simple Pendulum — Deep Dive

Simple Pendulum — Deep Dive

Snell's Law and Total Internal Reflection

Snell's Law and Total Internal Reflection

Solenoids and Toroids — Field Calculations

Solenoids and Toroids — Field Calculations

Sound — Concepts, Formulas & Solved Numericals

Complete guide to sound for Class 8, Class 9. NCERT solved examples and practice questions. Sound is a form of energy that travels as a mechanical wave —…

Springs in Series and Parallel

Springs in Series and Parallel

Stars And Solar System — for Class 8

Complete guide to stars and solar system for Class 8. NCERT solved examples and practice questions. Look up on a clear night, away from city lights, and you'll…

Standing Waves on Strings — Harmonics

Standing Waves on Strings — Harmonics

Surface Tension and Capillary Rise

Surface Tension and Capillary Rise — Class 11 physics complete guide with formulas, solved examples, and exam tips

Thermal Expansion — Why Things Get Bigger When Hot

Understand thermal expansion from first principles with intuitive explanations and solved problems. Almost every material expands when heated and contracts…

Thermodynamics — Laws, Processes & Efficiency for Class 11

Zeroth, first and second laws of thermodynamics, internal energy, heat, work, isothermal, adiabatic, isobaric, isochoric processes. NCERT Class 11.

Torque and Couple — Rotational Equilibrium

Torque and Couple — Rotational Equilibrium

Transformers — Step-Up vs Step-Down

Transformers — Step-Up vs Step-Down

Unit Conversion — SI, CGS, and Everything Between

Understand unit conversion from first principles with intuitive explanations and solved problems. Every physical measurement has two parts: a number and a unit.

Rocket Equation — Variable Mass Problems

Rocket Equation — Variable Mass Problems

Vectors in Physics — Intuition and Operations

Vectors in Physics — Intuition and Operations

Viscosity and Stokes' Law

Viscosity and Stokes' Law

Wave Optics — Concepts, Formulas & Solved Numericals

Complete guide to wave optics for Class 12. Solved examples, exam tips, PYQs. When Newton said light was a stream of particles, he wasn't entirely wrong — but…

Waves — Transverse, Longitudinal, Speed & Superposition for Class 11

Types of waves, wave speed, wavelength, frequency, superposition principle, standing waves, beats, Doppler effect. NCERT Class 11 Chapter 15.

Wheatstone Bridge — All Variants

Wheatstone Bridge — All Variants

Work, Energy and Power — Theorems, Conservation, Collisions

Work, Energy and Power — Theorems, Conservation, Collisions Work, energy, and power give us an alternative to Newton's laws for solving mechanics problems.

Young's Double Slit — Solving Strategy

Young's Double Slit — Solving Strategy

Young's Modulus — Solving Strain Problems

Young's Modulus — Solving Strain Problems