Important derivations of chapter-1 to 8

1-EF at axial,EF at equitorial,Guass law 2-V at axial &equitorial,capacitor,change in capacitance with change in medium b/w the plates of it,&energy stored in capacitor. 3- relation b/w drift velocity & current density, ohm's law by drift velocity &current density, kirchoff's law. 4-cyclotron,Buot servart law, Mf at center of circular coil,Mf at axis of circular coil,Mf due to long straight wire, Ampere circutal law, Mf in torroid , force b/w current carrying wire,torque at coil, conversion of galvanometer to ammeter & voltmeter. 5- earths magnetism,hysteresis loop, 6- motional emf,lenz law & conservation of energy,application of eddy current,self & mutual induction,Ac generator. 7- Capacitor connected to ac,inductor connected to ac, resonance, LCR circuit,impedence,power in Ac curcuit,transformer 8- Different types of wave.