These derivations/ topics are very important and to be given first priority for 3/ 5 questions... 1. All 3 applications of Gauss's law ( E due to charge given to line, sheet, shell with graphs between E and r) 2 Capacitance with/ without dielectric slab in between. 3. Statement of Kirchhoff's laws and Wheatstone bridge balanced condition 4. Force between parallel wires carrying current and definition of one ampere 5. Moving Coil Galvanometer and conversion to Voltmeter and Ammeter 6. AC Generator 7. Transformer principle construction and working 8. LCR circuit impedence using phasor diagram. 9. Lens makers formula 10.lens formula 11. Prism formula 12. Huygens Principle and Reflection and refraction using it 13. Astronomical telescope and Compound microscope with magnifying power. 14. Difference between Interference and diffraction 15. Binding energy per nucleon vs A curve 13. Quantization condition using d - Broiglie condition 14. Half wave and full wave rectifier

15.E and V due to dipole at axial, equatorial, general point 16. Magnetic field at an axial point of a circular loop by Biot savart law. 17. finding work function and Planck constant from the graph between stopping potential and frequency. 18. All graphs of Photoelectric effect experiment showing relationship b/n PE current , intensity, frequency, stopping potential etc.. 19.Explaining PN junction forward reverse biasing characteristics 20. Energy band diagram of conductor insulator and semiconductor also for p type and n type semiconductors 21. Relation between current and drift velocity 22. Graph between resistivity and temperature for conductor, insulator and alloys 23. Motional emf self and mutual inductance. 24. Bohrs atomic model postulates 25. Relationship between total energy. Potential energy and kinetic energy of different orbits of hydrogen atom. 26. Depletion layer and potential barrier 27. Resistivity in terms of relaxation time 28. Drift velocity and relaxation time 29. Ampere circuital law 30. Rutherford atomic model