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ISC Notes 2016 : for physics

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Twinkle Rawat
St. Dominic Savio College, Lucknow

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Chapter wise Theoretical Important Questions in Physics for Class-XII Electrostatics1. Derive an expression for the electric field at a point on the axial position of an electric dipole. 2. Derive an expression for the electric field at a point on the equatorial position of an electric dipole. 3. Describe the Principle, construction and working of Van de Graff generator. 4. Derive an expression for the energy stored in a capacitor. Show that whenever two conductors share charges by bringing them into electrical contact, there is a loss of energy. 5. Derive an expression for the effective capacitance when capacitors are connected in (a) series and (b) parallel 6. Explain the principle of a capacitor and derive an expression for the capacitance of a parallel plate capacitor. 7. State Gauss theorem and apply it to find the electric field at a point due to (a) a line of charge (b) A plane sheet of charge (c) A Charged spherical conducting shell 8. State Coulomb's law and express it in vector form. Derive it using Gauss theorem. 9. Derive an expression for the torque on an electric dipole in a uniform electric field. 10. Derive an expression for the work done in rotating an electric dipole in a uniform electric field 11. Derive an expression for the energy stored (Potential Energy) in a dipole in a uniform electric field. 12. Derive an expression for the electrostatic potential energy of a system of point charges 13. Derive an expression for the capacitance of a parallel plate capacitor with (a) a dielectric slab (b) a metallic plate in between the plates of the capacitor. 14. Define electric potential at a point. Derive an expression for the electric potential at a point due to (a) a point charge (b) a system of point charges (c) a dipole. 15. Show that the work done in an electric field is independent of path. 16. What are dielectrics? Distinguish polar and nonpolar dielectrics. Define the term Polarization vector. Current Electricity1. Define drift velocity and derive an expression for it. 2. Derive the expression I=nAevd 3. Deduce Ohm's law from elementary ideas and hence write an expression for resistance and resistivity. 4. Derive an expression for conductivity in terms of mobility 5. Explain the color coding of carbon resistors. 6. Derive an expression for the current in a circuit with external resistance R when (a) n identical cells of emf E and internal resistance r are connected in series (b) m identical cells are connected in parallel 7. State and explain Kirchhoff s laws. Compiled by Umesh Tyagi Department of Physics VBPS, Sec-28, Noida Page 1

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