Testing MCQ Engine and Quiz Maker Bridge

1. A component form for electrostatic force in one dimension gives . This means the force on has

2. Match the introductory electrostatics terms with their most suitable meanings.

3. A diagram for two equal unlike charges shows many lines going from the positive charge to the negative charge. At the midpoint between the charges, the electric field is directed

4. For an infinitely long line charge of density , the electric field magnitude at distance is

5. Consider the following statements about electric charge.
I. Electric charge can be positive or negative.
II. The sign of charge gives a fixed spatial direction.
III. A neutral body has zero net charge.
IV. Like charges repel each other.
The supported set is

6. Read the case below.

The magnitude of the net electric force on the charge is

7. A negatively charged rod is brought near the cap of a neutral electroscope without touching it. The leaves diverge during the approach, but the electroscope is not earthed. This observation is best explained by

8. At a far equatorial point of a dipole, where , the electric field magnitude is approximately

9. A charged rod is brought near two identical neutral spheres, one made of aluminium and the other made of plastic. The aluminium sphere shows stronger internal charge redistribution. The main reason is that aluminium

10. A neutral conducting sphere is charged by induction using a positively charged rod. The rod never touches the sphere. After the proper earthing sequence, the sphere becomes

11. The final sign of a conductor charged by induction is opposite to the sign of the inducing body because the conductor

12. Two point charges experience a force in vacuum. A dielectric of constant is introduced, and at the same time the separation is reduced to half of its original value. The new force is

13. Match each charge density with its defining expression.

14. For a point charge , the magnitude of electric field at a distance in vacuum is

15. The pair that contains one scalar and one vector from basic electrostatics is

16. Study the constant-symbol table and identify the mismatched row.

17. Near a positively charged conductor surface, the electric field just outside is directed

18. Study the sequence for charging a metal sphere by induction using a positively charged rod.

This sequence is unsuitable for leaving the sphere negatively charged mainly because

19. A plane surface is in a field . Its area vector is . The electric flux through the surface is

20. Study the field-line descriptions and identify the one that is not acceptable for an electrostatic field.

21. A small sphere marked is brought near another small sphere marked . The interaction between them is expected to be

22. Two point charges and are separated by in vacuum. The charges are changed to and , the separation is changed to , and a dielectric of constant is inserted. If the original force magnitude was , the new force magnitude is

23. The electric dipole consists of

24. A positively charged rod is brought near a neutral conducting sphere. The sphere is connected to earth and then isolated while the rod is still present. After the rod is removed, the charge spreads over the sphere because

25. The SI unit of electric flux is

26. A pair production event creates an electron of charge and a positron of charge . The total charge produced in this pair is

27. During rubbing, two initially neutral bodies acquire charges and . This result is a direct sign that

28. Two identical conducting spheres are isolated from surroundings. Sphere P has charge , and sphere Q is neutral. They touch and are then separated. The charge on each sphere after separation is

29. In a one-dimensional setup, is at , and is at . Take . The force on due to is

30. Study the table for medium effects in Coulomb force and identify the row that needs correction.

31. A neutral object is made by combining two charged parts. One part has charge . The charge on the other part must be

32. A neutral metal sphere is placed near a positively charged rod without touching it. The side of the sphere nearest the rod becomes relatively negative because

33. The statement represents the quantisation of electric charge, where must be

34. Electric charge in electrostatics is mainly introduced as the physical property responsible for

35. A positive charge is placed in a uniform electric field of magnitude . If its mass is , the acceleration magnitude is

36. A closed surface encloses a dipole made of charges and . The charges are both inside the surface. The net electric flux through the closed surface is

37. A body has charge . It then gains electrons. Taking , the final charge on the body is

38. A point charge produces an electric field at a point away in vacuum. Take . The field magnitude is

39. A student records four basic electrostatic symbols as follows.

The entry that needs correction is

40. A dipole is shown with at Point L and at Point R. The dipole moment direction is

41. A calculation uses . This is equivalent to using

42. Two very large parallel sheets carry equal and opposite surface charge densities and . In the region between the sheets, the electric fields due to the sheets

43. A copper rod and a rubber rod are each held at one end. When excess charge is placed near the held end, it spreads much more easily through the copper rod. This is mainly because copper

44. Study the Gauss-law table and identify the row that is incorrect.

45. A dipole has moment . At a far axial point, a student writes because Coulomb’s law has an inverse-square form. The correction is that the far dipole field varies as

46. A neutral object is placed near a charged comb and is attracted toward it. The attraction alone proves that

47. For two fixed charges, the graph of versus is best described as

48. Two electrons repel each other electrostatically and attract each other gravitationally. The reason these two forces have opposite nature for the same pair is that

49. The electric field of an ideal infinite uniformly charged plane sheet is independent of distance from the sheet because

50. For a dipole in a uniform electric field, the potential energy is minimum when the angle between and is