CBSE 12th 2026 Physics Must-Do Derivations for Exam Day: The Central Board of Secondary Education (CBSE) will conduct the CBSE Class 12 Examination 2026 from February 17 to April 10, 2026. Likewise, the CBSE Class 12 Physics Examination 2026 will be held on February 20, 2026. For 2026, 50% of the paper consists of competency-based questions (MCQs, case studies, source-based), 20% are standard MCQs, and 30% are descriptive constructed-response questions. The CBSE Class 12 Physics 2026 examination will be held for 70 marks in a duration of 3 hours.
For the 2026 CBSE Class 12 Physics exam, derivations are high-yield questions, often appearing in the 3-mark and 5-mark sections. Students appearing for the CBSE Class 12 Examination 2026 can check the CBSE 12th 2026 Physics Must Do Derivations for Exam Day available here.
Also Read: CBSE 2026 12th Admit Card Release Date: Last 3 Yeasr Trends
Check the CBSE 12th Physics Must-Do Derivations for Exam Day 2026 available below.
1. Electric Field due to uniformly Charged plate
Gauss Law Application
(Chapter 1: Electric Charges & Fields) | 11. Nuclear density is independent from Size & Mass no. A
(Chapter 13: Nuclei) |
2. Capacitance of partially filled dielectric in Parallel Plate capacitor
(Chapter 2: Potential & Capacitance) | 12. Relation between Current & Drift Velocity
(Chapter 3: Current Electricity) |
3. Torque on Dipole in E.F.
(Chapter 1: Electric Charges & Fields) | 13. Magnetic Field along the axis of C.C. Circular Loop
( Chapter 4: Moving Charges & Magnetism) |
4. Dipole Energy in uniform E.F.
(Chapter 2: Potential & Capacitance) | 14. Capacitance of Parallel Plate capacitor
(Chapter 2: Potential & Capacitance) |
5. Force on Current Carrying Parallel wires
(Chapter 4: Moving Charges & Magnetism) | 15. Electric Field due to Spherical Shell
Gauss Law Application
(Chapter 1: Electric Charges & Fields) |
6. Mutual Inductance of Solenoids
(Chapter 6: Electromagnetic Induction) | 16. Equivalent EMF Cells joined in Parallel combination
(Chapter 3: Current Electricity) |
7. Magnetic Field at the centre of C.C.Coil
(Chapter 4: Moving Charges & Magnetism) | 17. Relation b/w Refractive Index & min. deviation (PRISM)
(Chapter 9: Ray optics) |
8. Refraction at Spherical Surfaces
(Chapter 9: Ray Optics) | 18. Electric Field due to Infinitely long Thin wire
(Chapter 1: Electric Charges & Fields) |
9. Magnifying Power of Compound microscope when Final Image at D
(Chapter 9: Ray optics) | 19. Len's Makers Formula
(Chapter 9: Ray optics) |
10. Magnifying Power of Telescope when Final Image at Infinity
(Chapter 9: Ray optics) | 20. Snell's Law through Wave Theory
(Chapter 10: wave optics)) |
Every derivation must start with a neat, labeled diagram. Marks are often deducted if the diagram is missing. Clearly state any assumptions (e.g., "small aperture" in optics) before starting the mathematical steps. Always box the final formula and include the correct units where applicable.
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