# Phy Imp Questions

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1. Derive an expression for the Electric field at a point on the (i) axial line and (ii) equatorial line of an electric dipole 2. Describe the principle construction and working of Van de Graff Generator. 3. State Gauss’ theorem and apply it to find the electric field at a point due to 1. A point charge 2. A line of charge 3. A plane sheet of charge 4. A charged spherical conducting shell 4. Derive expression for the potential energy of a system of point charges. 5. Derive expression for the tor
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1.   Derive an expression for the Electric field at a point on the (i)   axial line and (ii) equatorial line of an electric dipole   2.   Describe the principle construction and working of Van de Graff    Generator.3.   State Gauss’ theorem and apply it to find the electric field at a   point due to   1.   A point charge   2.   A line of charge   3.   A plane sheet of charge   4.   A charged spherical conducting shell   4.   Derive expression for the potential energy of a system of point   charges.   5.   Derive expression for the torque on a dipole in a uniform electric   field.6.   Derive expression for the work done in turning a dipole in a   uniform electric field.7.   Derive an expression for the potential energy of a dipole in a   uniform electric field.8.   Explain the principle of a parallel plate capacitor   9.   Derive an expression for the capacitance of a parallel plate   capacitor.   10. Derive an expression for the effective capacitance   when three capacitors are connected in (i) series (ii)   parallel   11. Derive an expression for the energy stored in a   parallel plate capacitor.   12. Derive an expression for the loss of energy when   two conductors at different potentials are brought into   electrical contact. Account for this energy.   13. Derive and expression for the energy density of a   parallel plate capacitor.   14. Derive I = nAeV d    15. Define drift velocity and derive an expression for   it.16. Deduce Ohm’s law from elementary concepts.     17. State Biot Savart’s Law and apply it to find the   magnetic field at a point due to long straight conductor   carrying current   18. State Ampere’s circuital theorem and apply it to   find the magnetic field inside a (i) solenoid (ii) toroid   19. State the Principle of a potentiometer and Explain   how is it used (i) to determine the internal resistance of    a primary cell (ii) to compare the emfs of two primary   cells20. State Kirchhoff’s laws and apply it to derive   Wheatstone’s bridge principle.     21. Explain how will you use a metre bridge to find the   resistance of a given resistor wire?   22. Describe the elements of earth’s magnetic field.     23. Compare the properties of para dia and   ferromagnetic substances.   24. Derive an expression for the effective   resistance when three resistors are connected in (i)   series (ii) parallel   25. Describe the principle construction and working of    CYCLOTRON. Derive an expression for cyclotron   frequency. Why electrons cannot be accelerated in a   cyclotron?   26. Derive an expression for the force between two   straight long parallel conductors carrying constant   current and hence define one ampere.  27. Describe the principle construction and working   of Moving Coil Galvanometer.   28. Derive an expression for the torque on a current   carrying loop kept in a uniform magnetic field   29. Explain how will you convert a galvanometer into   (i) an ammeter (ii) a voltmeter   30. Define motional emf and derive an expression for   it.31. What are eddy currents? Explain its applications   32. What is self induction and self inductance? Derivean expression for the self inductance of a long solenoid   carrying current   33. Define mutual induction and mutual inductance.Derive an expression for the mutual inductance of a   pair of solenoids. What are the factors affecting the   mutual inductance of a pair of solenoids?   34. Derive an expression for the average value of ac   for a half cycle.   35. Derive an expression for the RMS value of ac   36. Explain the principle and construction of a   transformer and the various losses in a transformer.37. Derive an expression for impedance of a series   LCR circuit. Define resonance is series LCR circuit andderive an expression for resonant frequency.   38. Derive an expression for average power in an AC   circuit. Define power factor and show that the average   power consumed in a pure inductor or a pure capacitor   is zero.39. Define Q factor of resonance. Derive an expression   for Q factor.
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