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Home/ Questions/Q 715
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sherya sarkar
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sherya sarkarMaster
Asked: May 23, 20222022-05-23T17:14:59+05:30 2022-05-23T17:14:59+05:30In: CBSE

What are the derivations in class 12 physics in the CBSE Board?

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Derivations in physics are very important for CBSE class 12 board exams. Practicing them is necessary for getting good marks.

It’s going to be a long answer.

The following derivations are the most important from examination point of view. I am going to discuss them chapterwise. Try to learn the basic concept and application of these derivations instead of just mugging them up.

Here you go…

  • Electrostatics:
    • Coulomb’s law
    • Electric field intensity of a dipole at axial and equatorial positions
    • Electric field intensity at any point due to an ideal dipole
    • Force and torque acting on a dipole in an external uniform electric field
    • Work done to rotate a dipole in an external uniform electric field
    • Gauss’ theorem (verification and application)
    • Electric field intensity due to a thin uniformly charged plane sheet
    • Electric field intensity due to an uniformly charged spherical shell
    • Electric potential at a point due to a point charge
    • Capacitance of a parallel plate capacitor
    • Capacitance of a single and concentric sphere
    • Energy stored in a capacitor
    • Effect of dielectric medium on the capacitance of a parallel plate capacitor
    • Series and parallel combination of capacitor
  • Current electricity
    • Ohm’s law and it’s derivation
    • Drift velocity of free electrons and it’s relation with current
    • Series and parallel combination of resistors
    • Kirchhoff’s law and simple application
    • Learn formulas and practice numerical of the following
      • Meterbridge, Ammeter, Voltmeter, Potentiometer
  • Magnetic effects of current and electricity
    • Biot-Savart’s law
    • Magnetic field intensity due to a straight current carrying conductor of finite length
    • Magnetic field intensity due to a circular loop of current carrying conductor
    • Magnetic field at any point on the axis of a circular loop and coil
    • Ampere’s cicuital law and it’s applications
      • Magnetic field due to an infinitely long straight current carrying conductor
      • Magnetic field intensity at any point inside a straight infinitely long solenoid and toroid
    • Lorentz law and it’s properties
    • Motion of a charged particle in a magnetic field when the velocity is perpendicular to the magnetic field
    • Motion of a charged particle in a magnetic field when the velocity is not perpendicular to the magnetic field
    • Cyclotron (principal + construction + working)
    • Force on a current carrying conductor in an uniform magnetic field
    • Force and torque acting on a current carrying loop in an uniform magnetic field
    • Moving coil galvanometer (principle + construction + working)
    • Force between parallel current carrying conductors
  • Magnetism and matter
    • Magnetic field due to a magnetic dipole at axial line and equatorial line
    • Force and torque acting on a dipole moment in an external uniform electric field
    • Work done in rotating a magnetic dipole in an uniform magnetic field
    • Terrestrial magnetism
    • Dia, para and ferro magnetic substances
  • Electromagnetic induction
    • Faraday’s experiment
    • Motional EMF or induced EMF
    • Self inductance and work done
    • Mutual inductance
  • Alternating current
    • A.C. Generator (Diagram, Principle, Construction and working). Derive the expression for induced emf and current
    • Transformer ( Principle, Construction, Working and Theory).
      • How is current affected in transformer?
      • What are energy loss in transformers, how can they be reduced?
    • Mathematical treatment of L-C oscillation
    • Conservation of energy in L-C oscillation
    • Define power for an A.C. circuit. Derive an expression for the average of a series L-C-R circuit connected to an A.C. source. Discuss the various special cases
    • Impedance, Reactance and average power in series L-C-R, L-R, L-C or C-R circuit
    • Derive an expression for the impedance of a series LCR circuit using phasor diagram
    • Resonance condition of a series LCR circuit. Calculate is resonant frequency
    • Sharpness of resonance in a series resonant circuit. Find expression for Q-factor of circuit
    • A.C. circuit containing
      • Inductor
      • Resistor
      • Capacitor
      • Draw phasor diagram, graph of E and V versus wt
    • Average value of A.C. over one complete cycle
    • Relation between the rms value and peak value of an alternating current
    • Relation between the effective and peak value of an alternating current
    • Relation between average value and peak value of an alternating current
  • Electromagnetic waves
    • Derivation of displacement current
    • Characteristics and properties of EM waves
    • Electromagnetic spectrum
  • Ray optics and optical instruments
    • Reflection from spherical mirror and find relation between f and r
    • Mirror formula using concave and convex mirror
    • Total internal reflection
    • Refraction through spherical surfaces
    • Lens maker’s formula
    • Refraction through a glass prism and minimum angle of deviation
    • Scattering of light
    • Optical instruments
  • Wave optics
    • Expression for the intensity at any point on the observation screen in Young’s double slit experiment and find the condition for constructive and destructive interference
    • Expression for fringe width in Young’s double slit experiment. How can the wavelength of monochromatic light be found by this experiment?
    • Diffraction using single slit
    • Deduce expression for
      • Angular width of Central maximum
      • Linear width of Central maximum
      • Linear width of secondary maximum
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