Mock Test – 01 : Magnetic Effects of Electric Current

1. A piece of material that has both attractive and directive properties is called __________.

2. Equidistance parallel magnetic field lines indicate:

3. A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference

4. The factors on which one magnetic field strength produced by current carrying solenoids depends are

5. No two field lines are found to intersect each other. If they intersect, then at the point of intersection, the compass needle would point

6. Right hand thumb rule is used to determine the

7. After drawing the magnetic field lines around the bar magnet with the help of a compass needle, a student writes the following statements:

I. Symmetrical magnetic field lines pattern is obtained on both the sides of bar magnet.

II. The field lines around the bar magnet follow the pattern of iron filling around the magnet.

III. Deflection increases as the needle is moved towards the pole of a bar magnet.

IV. At the poles of a bar magnet, opposite poles of a compass needle comes to rest.

Choose which of the following would be correct statement(s).

8. Suppose a horseshoe magnet is held vertically upwards with the North Pole is on left. A wire passing between the poles carries a direct current directed away from you. In what direction is the magnetic force exert on the wire?

9. The magnetic field at a point due to current carrying conductor is directly proportional to

10. Every section of the current carrying circular loop contributes to the magnetic field lines within the loop is in the

11. Which one of the following would not experience a force while moving perpendicular to a uniform magnetic field?

12. The nature of magnetic field line passing through the centre of current carrying circular loop is

13. How can you find the direction of magnetic field from a magnetic field line?

14. The strength of each of magnet reduces to half when it cut along its length into the equal parts magnetic field strength of a solenoid. Polarity of solenoid can be determined by

15. When current is parallel to magnetic field, then force experience by the current carrying conductor placed in uniform magnetic field is

16. A bar magnet is cut into two pieces along its length. Which of the following statement is true?

17. A.C generator works on the principle of

18. Which of the following factors affect the strength of force experience by a current carrying conduct in a uniform magnetic field?

19. Direction of rotation of a coil in electric motor is determined by

20. A soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid

21. Polarity of a current carrying solenoid can be determined by

22. The instrument that use to detect electric current in the circuit is known as

23. The diagram below shows the magnetic field lines due to a current in a straight conductor.

Something was done to the current because of which the magnetic field lines changed as shown below.

What was done to the current?

24. A positive charge is moving upwards in a magnetic field directed towards north. The particle will be deflected towards

25. A freely suspended magnet always rests in geographically north and south direction because

26. A copper wire is held between the poles of a magnet.

The current in the wire can be reversed. The pole of the magnet can also be changed over. In how many of the four directions shown can the force act on the wire?

27. Which of the following process will produce new magnetic poles?

28. The condition for the praenomen of electromagnetic induction is that there must be a relative motion between

29. We can induce the current in a coil by

30. Oersted experiment prove that when an electric current is passed through a conducting wire, a _________ is produced around it.

31. Which of the following statement is not correct about the magnetic field?

32. The pattern of magnetic field lines around a current carrying solenoids resemble with the pattern of magnetic field lines

33. The factors on which one magnetic field strength produced by current carrying solenoids depends are

34. A current through a horizontal power line flows from south to North direction. The direction of magnetic field line 0.5 m above it is towards

35. If the direction of current in a solenoid, when viewed from a particular end, is clockwise, then this end of the solenoid will be:

36. When a current flows through a straight conductor, a magnetic field is produced around it. Consider the following statements about this field:

I. The direction of the magnetic field of a current carrying straight conductor is determined by right-hand thumb rule.

II. A charged body placed in this field experiences a force whose direction is given by Fleming’s left hand rule.

III. The magnetic field lines around a current carrying straight conductor are in the form of concentric circles with the conductor as the centre.

The correct statement(s) is/are:

37. The resultant magnetic field at point ‘P’ situated midway between two parallel wires (placed horizontally) each carrying a steady current I is

38. Inside the magnet, the field lines moves

39. The pattern of the magnetic field produced by the straight current carrying conducting wire is

40. The front face towards the observer of a current carrying solenoid behaves like a north pole. The direction of current in this face is

41. By which instrument, the presence of magnetic field be determined?

42. The strength of magnetic field around a current carrying conductor is

43. Relative strength of magnetic field at a point in the space surrounding the magnet is shown by the

44. In electric motor, to make the coil rotating continuously in the same direction, current is reversed in the coil after every half rotation by a device called

45. Magnetic needle is/an

46. Who has stated the Right hand Thumb Rule?

47. The important features(s) of magnetic field inside the current carrying solenoid is/are

48. Magnetic effect of current was discovered by

49. The direction of force acting on current carrying conductor in external magnetic field is given by

50. A soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid