MDCAT XII Physics Electrostatics Online Test-2

1. Which one is/are correct regarding gravitational and electrostatic forces?

2. What is the potential at 2 cm from the center of a 4 microcoulomb charged sphere of diameter 8 cm?

3. The concept of the electric field was given by:

4. What is the electric flux through a surface of 5 m² placed parallel in a uniform field of 10 N/C?

5. Flux through a surface depends on:

6. What is the electric field of a 10 C charge that is experiencing a force of 50 N?

7. If the potential on a capacitor is doubled, what will happen?

8. Potential energy stored in a capacitor of 10 F when the charge stored is 2 C is:

9. Force between two charges placed at distance r is F. When the distance between them is reduced to one-third, the force becomes:

10. When a dielectric material is placed between the plates of a capacitor, the capacitance of the capacitor:

11. Which one has the maximum dielectric constant?

12. What is the value of electric potential at 4 m away from a 4 microcoulomb charge?

13. Four capacitors each of 6 F are connected as shown in the diagram. What is the equivalent capacitance between A and B?

14. Time constant is the duration in which 63.2% of the ------- charge of a capacitor is deposited on its plates.

15. Potential gradient at any point in an electric field is equal to:

16. What is the potential gradient between two charged plates separated by 2 cm when the potential difference is 2 V?

17. Select incorrect statement regarding electric field lines:

18. An electric dipole is a system which contains:

19. Some capacitors are connected in series. When two other capacitors are added in the same way, the capacitance:

20. The figure shows:

21. Sharks have the potential to:

22. The diagram shows that the electric flux through the surface is:

23. Electric ---------- is the work done on a charge to move it from -------- potential to -------- potential.

24. The energy of a charged capacitor resides in:

25. A charge of magnitude 0.5 C is accelerated through a potential difference of 500 V. How much kinetic energy is acquired by the charge?

26. RC constant is measured in:

27. In which combination is capacitance increased by decreasing the number of capacitors?

28. Electric field around a charge is:

29. When a positively charged particle is brought inside a negatively charged sphere (charge distributed on its surface), the positive charge:

30. A free test charge placed in an electric field moves in the direction of:

31. Average voltage stored on a capacitor during charging is:

32. Two charges, one 10C and the other -2C, attract each other with a force of 20N. If 2C charge is added to each, what is the new force between them?

33. Which of the following are vector quantities?

34. Which type of capacitor allows control of capacitance by changing the relative area?

35. Capacitance is measured in:

36. Permittivity of a conductor is:

37. Two capacitors, each of 3F, are connected in parallel. Three such pairs are connected in series. What is the equivalent capacitance of the system?

38. There are 4 charges: q1 (positive) and q2 (negative) placed inside a metallic sphere; q3 (positive) and q4 (negative) placed outside the sphere. Which charges contribute to calculating flux through the metallic sphere?

39. Cₘ/C equals:

40. If RC is much greater than 1, then the capacitor is charged:

41. If potential difference increases, what happens to the energy stored in the capacitor?

42. How much energy is stored in a 10F capacitor at a potential difference of 2V?

43. ----------- is also called the dielectric constant:

44. Which property of charges is used for detecting another charge?

45. Dielectric material used in a capacitor should be:

46. Two charges A and B are placed 10cm apart. Charge A is 1μC and charge B is 2μC. What is the ratio of force exerted on A to B?

47. If three capacitors, each of 300μF, are connected in parallel, what is the equivalent capacitance?

48. Three capacitors are connected in a triangle shape as shown in the diagram. Which of the following is correct regarding the diagram?

49. Three capacitors, each of 1F, are connected as shown in the diagram. What is the equivalent capacitance between A and B?

50. If the charge stored on a capacitor is doubled, the capacitance: