1. The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as
2. As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
3. Which of the following circuit element stores energy in the electromagnetic field ?
4. The inductance of a coil will increase under all the following conditions except
5. Higher the self-inductance of a coil is _______.
6. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will
7. An open coil has ______.
8. Both the number of turns and the core length of an inductive coil are doubled.Its self-inductance will be
9. If current in a conductor increases then according to Lenz's law self-induced voltage will
10. The direction of incViced e.m.f. can be found by
11. Air-core coils are practically free from
12. The magnitude of the induced e.m.f. in a conductor depends on the
13. Mutually inductance between two magnetically-coupled coils depends on
14. A laminated iron core has reduced eddy-current losses because
15. The law that the induced e.m.f. and current always oppose the cause producing them is due to
16. Which of the following is not a unit of inductance ?
17. In case of an inductance, current is proportional to
18. Which of the following circuit elements will oppose the change in circuit current ?
19. For a purely inductive circuit which of the following is true ?
20. Which of the following is unit of inductance ?
21. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
22. The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the in ductance will be
23. The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is
24. Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
25. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be
26. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be
27. In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be
28. A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
29. A conductor 2 metres long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be
30. Lenz's law is a consequence of the law of conservation of
31. A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly
32. Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.
33. The co-efficient of coupling between two air core coils depends on
34. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is
35. A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
36. Which of the following inductor will have the least eddy current losses ?
37. A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
38. Two 300 uH coils in series without mutual coupling have a total inductance of
39. Current changing from 8 A to 12 A in one second induced 20 volts in a coil.The value of inductance is
40. Which circuit element(s) will oppose the change in circuit current ?
41. A crack in the magnetic path of an inductor will result in
42. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
43. A moving magnetic field will produce the same effect as a conductor that is moving.
44. The polarity of the induced voltage can be determined by using the left-hand generator rule.
45. Increasing the field or increasing the current will decrease the force on the conductor.
46. Reversing the field or the current will reverse the force on the conductor.
2. As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
3. Which of the following circuit element stores energy in the electromagnetic field ?
4. The inductance of a coil will increase under all the following conditions except
5. Higher the self-inductance of a coil is _______.
6. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will
7. An open coil has ______.
8. Both the number of turns and the core length of an inductive coil are doubled.Its self-inductance will be
9. If current in a conductor increases then according to Lenz's law self-induced voltage will
10. The direction of incViced e.m.f. can be found by
11. Air-core coils are practically free from
12. The magnitude of the induced e.m.f. in a conductor depends on the
13. Mutually inductance between two magnetically-coupled coils depends on
14. A laminated iron core has reduced eddy-current losses because
15. The law that the induced e.m.f. and current always oppose the cause producing them is due to
16. Which of the following is not a unit of inductance ?
17. In case of an inductance, current is proportional to
18. Which of the following circuit elements will oppose the change in circuit current ?
19. For a purely inductive circuit which of the following is true ?
20. Which of the following is unit of inductance ?
21. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
22. The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the in ductance will be
23. The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is
24. Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
25. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be
26. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be
27. In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be
28. A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
29. A conductor 2 metres long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be
30. Lenz's law is a consequence of the law of conservation of
31. A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly
32. Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.
33. The co-efficient of coupling between two air core coils depends on
34. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is
35. A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
36. Which of the following inductor will have the least eddy current losses ?
37. A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
38. Two 300 uH coils in series without mutual coupling have a total inductance of
39. Current changing from 8 A to 12 A in one second induced 20 volts in a coil.The value of inductance is
40. Which circuit element(s) will oppose the change in circuit current ?
41. A crack in the magnetic path of an inductor will result in
42. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
43. A moving magnetic field will produce the same effect as a conductor that is moving.
44. The polarity of the induced voltage can be determined by using the left-hand generator rule.
45. Increasing the field or increasing the current will decrease the force on the conductor.
46. Reversing the field or the current will reverse the force on the conductor.
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