JKBOSE Class 12 Physics

Important Derivations and Topics for JKBOSE Class 12 Physics (2025-26) | Asterisk Classes

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JKBOSE Class 12 Physics

The Ultimate 50 Topic Masterlist

Session 2025-26

Electrostatics & Current Electricity

Weightage: ~15 Marks | Focus: Gauss Law & Potentiometer

  1. Electric Dipole: Field at Axial and Equatorial positions. Derivation
  2. Gauss’s Law: Application for Infinitely Long Wire and Thin Sheet. 5 Marks
  3. Capacitance: Parallel Plate Capacitor with Dielectric slab.
  4. Drift Velocity: Derivation of current relation \(I = nAev_d\).
  5. Wheatstone Bridge: Balancing condition \(\frac{P}{Q} = \frac{R}{S}\).
  6. Potentiometer: Comparison of EMFs and Internal Resistance. 5 Marks
[Image of potentiometer circuit diagram]

Magnetism, EMI & AC

Weightage: ~16 Marks | Focus: LCR & Devices

  1. Biot-Savart Law: Magnetic field on the axis of a Circular Loop.
  2. Cyclotron: Principle, construction, and frequency. Device
    3. [Image of cyclotron diagram physics]
  3. Moving Coil Galvanometer: Principle and sensitivity. 5 Marks
  4. Mutual Induction: Inductance of two long solenoids \(M = \mu_0 n_1 n_2 A l\).
  5. LCR Series Circuit: Impedance and Resonance conditions.
  6. AC Generator & Transformer: Working and energy losses. 5 Marks
[Image of Transformer physics diagram]

Unit VI: Optics (Ray & Wave)

Weightage: ~14 Marks | The High-Scoring Section

  1. Lens Maker’s Formula: Full derivation for thin lenses. 5 Marks
  2. Prism Formula: Refractive Index derivation \(\mu = \frac{\sin(A+D_m)/2}{\sin(A/2)}\).
    3. [Image of prism refraction diagram]
  3. Optical Instruments: Microscope and Telescope Ray Diagrams.
  4. Huygens’ Principle: Proof of Laws of Reflection/Refraction. Guaranteed
  5. YDSE: Derivation of Fringe Width \(\beta = \frac{\lambda D}{d}\).
  6. Polarization: Brewster’s Law and Malus Law.

Modern Physics & Semiconductors

Weightage: ~15 Marks | Focus: Graphs & Logic Gates

  1. Photoelectric Effect: Einstein’s Equation \(K_{max} = h\nu – \Phi_0\).
  2. Bohr’s Model: Radius and Energy derivations.
  3. Radioactivity: Law of Decay \(N = N_0 e^{-\lambda t}\).
  4. Binding Energy Curve: Significance and nucleon stability.
  5. Rectifiers: Half Wave and Full Wave working. 5 Marks
    6. [Image of full wave rectifier circuit diagram]
  6. Logic Gates: Symbols and Truth Tables for NAND/NOR.

Asterisk Classes: Expert Tips

  • Diagram Priority: For device questions (Cyclotron/Transformer), the diagram should be your first step. It secures baseline marks.
  • Modern Physics: Focus on the graphs of photoelectric effect. They are low-effort, high-reward 2-mark questions.
  • Formula Check: In numericals, always convert units to SI (e.g., cm to m) before starting the calculation.
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