**Also Read:**

**Latest CBSE Syllabus of Classes 9 to 12 for 2018-19**

As

**CBSE Board Exams**are near, Class 12 Board students start working extra hard to score high in Board Exams.Now a days students got very tensed about PHYSICS and try to search like -

- Important Topics for Class 12 Physics
- Most Important derivations in Class 12 Physics
- Important derivations on Electrostatics and Magnetism etc.

Although All the Topics mentioned in CBSE
Class 12 Physics Syllabus are Important ,but the weightage of Derivations in
CBSE Class 12 Physics Board Exam is high. So, after analysis of Previous Years
Question Papers and Sample Papers issued by CBSE, we have prepapred a complete
list of Most Important derivations in Class 12 Physics,which we are going to
provide you below :

##
**Most Important Derivations In CBSE
Class 12 Physics**

__Unit – 1 Electrostatics__**1.**Derive Coulomb's law in vector form.

**2.**Derive an expression for electric field due to a short dipole

**(i)**at a point on the axial line

**(ii)**at a point on equatorial line.

**3.**Derive an expression for Torque of electric dipole placed in uniform Electric Field.

**4.**Derive expression for Potential Energy of an electric dipole placed in uniform Electric Field.

**5.**Derive an expression for Electric field due to Infinitely long uniformly charged straight wire.

**6.**Derive an expression for Electric field strength due to an infinite plane sheet of uniform surface charge density.

**7.**Derive an expression for Electric field strength due to a uniformly charged thin spherical shell at external point, at the point on surface , at internal point.

**8.**Derive an expression for electric potential on (i) Axial Point (ii) Equatorial Point.

**9.**Derive expression for Capacitance of a Parallel plate Capacitor.

**10.**Derive expression for Energy stored in a charged capacitor.

**11.**Derive expression for the Capacitance of a parallel plate capacitor when a thin dielectric slab is placed between the plates of capacitor.

**12.**Drive an expression for drift velocity of electron in a metallic wire placed in Electric field and also establish a relation between Electric current and Drift velocity.

**13.**Derive expression for equivalent EMF of cells connected in series and parallel combinations.

__Unit – 3 Magnetic Effects of Current and Magnetism__**14.**Derive expression for Magnetic field due to a Current carrying Circular coil at a point on its axis.

**15.**Derive expression for Magnetic field due to a Straight current carrying infinite length conductor.

**16.**Derive Magnetic field due to Current carrying Solenoid.

**17.**Derive expression for Force between two parallel current carrying conductors.

__Unit – 4 Electromagnetic Induction and Alternating Current__**18.**Derive expression for Mutual Inductance between two current carrying coils.

**19.**Derive expressions for Mean and RMS value of Alternating current.

**20.**Derive expression for Impedance of a series RLC circuit.

**21.**Derive expression for Average power dissipation in series RLC circuit.

__Unit – 5 Electromagnetic waves__**22.**What is Displacement Current and explain the Ampere – Maxwell Law.

__Unit – 6 Optics__

**23.**Show the formation of Image of a point object due to refraction of light by Spherical surface seperating two medium of refractive index n

_{1}and n

_{2}and derive the relation between n

_{1}, n

_{2}, u, v and radius of curvature.

**24.**Derive Lens maker's formula.

**25.**Derive expression for Magnifying power of Compound microscope.

**26.**Derive an expression for Magnifying power of Astronomical Telescope.

**27.**Derive an expression for Angle of deviation and hence Prism formula.

**28.**Derive a mathematical expression for the width of Interference fringes obtained in Young's double slit experiment.

**29.**Explain the formation of a pattern of fringes obtained on the screen in Single slit Diffraction experiment and hence derive expression for width of Central Maxima.

__Unit – 7 Dual Nature of Radiation and Matter__**30.**Derive Einstein's Photoelectric Equation.

__Unit – 8 Atoms and Nuclie__**31.**Derive expression for Radius of Hydrogen Atom.

**32.**Derive expression for half life and mean life of a radioactive substance.

__Unit – 9 Semiconductors and Electronic Devices__**33.**Derive Amplification factor for Common Base and Common Emitter Amplifiers.

__Unit – 10 Communication systems__**34.**Derive an expression for covering range of TV transmission Tower.

**Some Important Tips to score High in Class 12 Physics Exam**1. Understand the weightage of Chapters and plan your Study according to that:

- Electrostatics – 08 marks
- Current electricity – 07 marks
- Magnetic effect of current and magnetism – 08 marks
- EMI and AC – 08 marks
- EM Waves – 03 marks
- Optics – 14 marks
- Dual nature of radiation and matter – 04 marks
- Atoms and Nuclei – 06 marks
- Electronic Devices – 07 marks
- Communication systems – 05 marks

2. Underline or Highlight the Important Points and definitions for last time revision.

3. Draw neat and clean diagrams and graphs.

4. Try to practice Sample Papers with in time limit.

5. Practice at least last five years Question Papers.

Don't worry , work Hard ,Stay Happy !!

ALL THE BEST !!

**More Resources :****CBSE Class 12 Maths Study Material****CBSE Class 12 Physics Study Material****CBSE Class 12 Sample Papers and Previous Years Question Papers with Solution**

are all of these derivations in ncert or do we have to look for them in other books like sl arora

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