Tell me plzzz the important derivation in physics class 12 from the point of board

Dear student

Kindly go through given importannt derivations

Application of Gauss theorem in calculation of electric field
Electric field intensity due to a thin infinite plane sheet of charge
Electric field intensity of an electric dipole on equatorial line 
Electric field intensity of an electric dipole on axial line 
Relation between current and drift velocity
Expression for drift velocity
Series and parallel connection of resistors
Force between two parallel current carrying conductors
Torque on a magnetic dipole (bar magnet) in a uniform magnetic field.
Self and mutual induction
Derivation of Emf induced in a rod moving in a uniform magnetic field.
Impedance, reactance and average power in series LCR, LR, LC or CR circuit.
Relation between peak and rms value of current
Common emitter transistor amplifier
Common base transistor amplifier
Frequency modulation and amplitude modulation
Current loop as a magnetic dipole and its magnetic dipole moment

With regards
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