Physics — Last-Minute Revision
High-priority revision for the TS Inter 2nd Year Physics board exam — the most important chapters, formulae, derivations and diagrams. Paper: 60 marks · 3 hours.
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High-Yield Chapters (focus last night)
- •Ray Optics — lens formula, mirror formula, prism, optical instruments (LAQ+SAQ)
- •Current Electricity — Kirchhoff's laws, potentiometer, meter bridge (LAQ+SAQ)
- •Moving Charges — Biot-Savart, Ampere's law, galvanometer conversion (LAQ)
- •Semiconductor Electronics — diode, rectifier, transistor, logic gates (LAQ)
- •Electromagnetic Induction + AC — Faraday, LCR circuit, transformer (LAQ)
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Formula Quick-Check
- •Lens formula: 1/v − 1/u = 1/f (Cartesian sign convention)
- •Young's double slit fringe width: β = λD/d
- •Lorentz force: F = q(v × B), F = qvB sin θ
- •EMF (Faraday): ε = −dΦ/dt
- •Photoelectric: KE_max = hν − φ = hν − hν₀
- •de Broglie: λ = h/mv = h/p
- •Bohr orbit radius: rₙ = n²a₀ (a₀ = 0.529 Å)
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Derivations to Re-scan
- •Expression for electric field due to a point charge (Gauss's law)
- •Derivation of capacitance of parallel plate capacitor
- •Kirchhoff's junction rule (conservation of charge)
- •Derivation of magnetic field using Biot-Savart law for circular loop
- •Einstein's photoelectric equation derivation
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Diagrams Must-Know
- •Ray diagram for concave mirror (real inverted image and virtual erect image)
- •Compound microscope ray diagram
- •Full-wave bridge rectifier circuit
- •Common-emitter transistor amplifier circuit
- •p-n junction diode with depletion layer (forward and reverse bias)
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Exam-Day Tips
- •Write formula, substitute with units, calculate — always in this order for numericals
- •Label all diagram arrows and parts — marks are given for labelling
- •State the law/principle at the start of each derivation
- •For logic gates, draw the symbol and truth table together
- •In AC circuits, write phasors or voltage-current equations before solving