CBSE Class 12 Physics Important Derivations: Physics derivations are the backbone of concepts in electromagnetism, optics, modern physics, and many other chapters. They test your understanding of the fundamentals and your ability to logically apply concepts. Many questions in board exams are directly or indirectly based on these derivations, making them a scoring area.
CBSE also asks direct questions on derivations which becomes the scoring part for students who have properly practiced the step-by-step derivation of formulas. Check the chapters and topics of CBSE Class 12 Physics which will frame important derivation questions in 2026 board exams.
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CBSE Class 12 Physics Important Derivations For 2026 Exams
Ch -1 Electric Charges and Fields
- Application of Gauss’s theorem
- Electric Field due to dipole
- Electric field in Uniform External Field
Ch-2 Electric Potential and Capacitance
- Electric dipole due to Electric Field
- Potential Energy of System of two point charges in external field
- Effect of dielectric on capacitance
- The parallel plate capacitor
Ch-3 Current Electricity
- Drift Velocity and Deduction of Ohm’s Law from drift velocity
- Combinations of cell
Ch-4 Moving Charges and Magnetism
- Magnetic field due to current carrying circular loop on its axis
- Magnetic field due to infinitely long straight wire
- Force between two parallel current carrying conductors
- Torque experienced by a current loop in Uniform Magnetic Field
Ch-5 Magnetism and Matter
- No derivation
Ch-6 Electromagnetic Induction
- Inductance , Energy stored in an Inductor
Ch-7 Alternating Current
- Series LCR circuit
- Power in an AC circuit
Ch-8 Electromagnetic Waves
- No Derivation
Ch-9 Ray Optics
- Mirror Formula
- Refraction at spherical surfaces
- Lens Maker’s formula
- Combination of thin lenses in contact {Power derivation}
- Refraction through Prism
- Optical Instruments
Ch-10 Wave Optics
- Proof of laws of Refraction & Reflection using Huygens's Law
- Interference
Ch-11 Dual Nature of Radiation and Matter
- Einstein’s Photoelectric equation
Ch-12 ATOMS
- Bohr’s Model of Hydrogen atom
Ch-13 Nuclei
- No Derivation
Ch-14 Semiconductor Electronics
- Conductivity of Semiconductor
What Is a Derivation?
A derivation is a step-by-step explanation of how a formula or equation is developed using basic principles, laws, or formulas. It helps us understand where the formula comes from and how it works. For example, when we derive the formula for the area of a circle, we use simple steps based on the radius and pi (π). Derivations are important because they show the logic behind the formulas we use, making it easier to apply them in different situations.
How to Master CBSE Class 12 Physics Derivations?
Follow these topics to understand and learn the derivations easily:
- Before jumping into derivations, ensure you are clear on fundamental concepts and formulas.
- Repeatedly write down derivations to improve recall and presentation.
- Diagrams and flowcharts can make derivations easier to understand and remember.
- In board exams, neat and well-structured derivations with labelled diagrams fetch higher marks.
CBSE Class 12 Physics Important Questions 2025-26
The important questions for CBSE Class 12 Physics are prepared by analysing previous year question papers, sample papers, and chapter-wise weightage. These include frequently asked numericals, derivations, conceptual explanations, ray diagrams, circuit diagrams, and case-study-based questions. Practising important questions improves problem-solving speed and builds confidence in handling complex numericals from chapters like Electrostatics, Magnetism, and Optics. Regular practice also helps students understand how to present answers as per the CBSE marking scheme.
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CBSE Class 12 Physics Sample Papers 2025-26
The CBSE Class 12 Physics sample papers 2025-26 reflect the latest exam pattern and marking scheme, making them one of the most reliable preparation tools. Solving sample papers helps students understand the distribution of marks across different units and question types. It also allows them to assess their preparation level, identify weak areas, and improve answer presentation. Attempting sample papers in a timed environment significantly boosts confidence and exam-readiness for the 2026 board exam.
CBSE Class 12 Physics Previous Year Question Papers
The previous year question papers (PYQs) of CBSE Class 12 Physics provide valuable insight into recurring concepts, important numericals, and frequently asked derivations. Solving PYQs helps students recognise exam trends and understand the level of difficulty they can expect in the board exam. It also enhances conceptual clarity and improves speed and accuracy. Regular practice of PYQs is one of the most effective ways to strengthen Physics preparation and reduce exam anxiety.
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