SUBJECT : PHYSICS - SSA Punjab

10. An air capacitor is given a charge of 2µC raising its potential to 200V. Ifon inserting a dielectric medium its potential falls to 50V, what is the dielectricconstant of the medium?11. In a parallel plate, how is the capacity affected, when without changingthe charge: (i) the distance between the plates is doubled (ii) area of the platesis halved.12. Prove that the total energy stored in series combination of capacitors isequal to the sum of energies stored in the individual capacitors.13. Prove that the total energy stored in parallel combination of capacitors isequal to the sum of energies stored in the individual capacitors.214. Prove that energy stored per unit volume in a capacitor is given by E34VV1ε0;2E is the electric field of the capacitor.15. If a parallel plate capacitor of capacitance C is kept connected to a supplyvoltage V to just fill the space and then a dielectric slab is inserted between theplates. What will be the change in the capacitance, potential difference, thecharge, electric field and the energy stored.16. A parallel plate capacitor of capacitance C is charged to a potentialdifference V and then the battery is disconnected. Now a dielectric slab of thedimensions equal spacing between the plates is inserted between the plates.What are the changes, if any, in the capacitance, charge, potential difference,electric field and the energy stored.17. What limits maximum potential to which the hollow sphere in Van deGraff generator can be raised?18. Why the Vande Graff generator is enclosed inside an earth connectedsteel tank filled with air under pressure?19. N small drops of same size are charged to V volt each. They coalesce toform a bigger drop. Calculate the potential of the bigger drop.20. Fig shows the variation of charge Q vs. potentialdifference V for two capacitors C 1 and C 2 .The two capacitorshave same plate separation but the plate area of C 2 is doublethat of C 1 . Which of the two lines in the fig correspond to C 1and C 2and why?21. Fig show the variation of voltage V across the platesof two capacitors A and B versus increase of charge Qstored on them. Which of the two capacitors has highercapacitance? Give reason.22. How will the capacitance of a parallel plate capacitorbe affected if (a) The Area of each plate is increased (b) Thedistance between each plate is increased23. What is the area of the plates of a parallel plateBAQQAB