Question

Most important derivation for CBSE class 12 exam 2018

Answer 1

Unit No 1: Electrostatics

1. Coulomb’s Law in Vector Form
2. Newton’s Third Law
3. Electric Field Intensity on Axial Line & Equatorial Line of an Electric Dipole
4. Electric Potential due to a point charge.
5. Electrical Potential on Axial Line & Equatorial Line of Electric Dipole
6. Electric Field Intensity at various point due to a uniformly charged spherical shell (thin and thick both)
7. Electric Potential due to a thin infinite plan sheet of charge
8. Capacitance of parallel plate capacitor (with or without dielectric medium)
9. Application of Gaus Theorem

Unit No 2: Current Electricity

1. Expression of drift velocity
2. Relation between drift velocity and current
3. series and parallel connection of resistors
4. Application of Gaus Theorem is calculation of electric field intensity due to a thin infinite plane sheet of charge and uniformly charged spherical shell (or conducting sphere)

Unit No:03: Magnetic Effects of Current and Magnetism

1. The biot-savert law in the calculation of magnetic field due to current carrying circular loop
2. Ampere’s law and its application
3. Force on a moving charge in uniform magnetic and electric fields
4. Cyclotrons
5. Force on a current carrying in a uniform magnetic field
6. Force between two parallel current carrying conductors
7. Torque experienced by a current loop in uniform magnetic fields
8. Current loop as a magnetic dipole and its magnetic dipole moment
9. Magnetic dipole moment of a revolving electron
10. Magnetic field intensity due to magnetic dipole (bar magnetic) along its axis and its perpendicular axis
11. Torque on a magnetic dipole (bar magnet) in a uniform magnetic field

Unit No: 04 Electromagnetic Induction and Alternating Current

1. EMF (i.e. EMF induced in a rod moving in Uniform EMF)
2. Self and mutual induction
3. Relation between peak and RMS value current
4. Reactance, impedance and average power in series LCR, LR, CR circuit
5. Resonance in case of series LCR circuit

Unit No 05: Electromagnetic Waves

1. Displacement Current

Unit No 06: Optics

1. Lens-Makers Formula
2. Refraction at convex surfaces
3. Refraction index at minimum deviation in prism
4. Young’s double slit experiment
5. Diffraction using single slit
6. Polarisation
7. Minimum deviation in prism

Unit No 07: Dual nature of radiation and matter

1. Relationship between cut off potential, frequency of the incident photon and thersold frequency
2. De broglie relation

Unit No 08: Atoms and Nuclei

1. Radius of hydrogen-like atoms

Unit No 09: Electronic Devices

1. Common base transistor amplifier
2. Common emittor tranistor amplifier

Unit 10: Communication system

1. AM and FM (Amplitude and frequency modulation)

These are some important derivation which you have to practice

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