Which of the following is not a unit of inductance?
Which of the following is not a unit of inductance?
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
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
In case of an inductance, current is proportional to
In case of an inductance, current is proportional to
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is
The coefficient of coupling between two air core coils depends on
The coefficient of coupling between two air core coils depends on
The magnitude of the induced e.m.f. in a conductor depends on the
The magnitude of the induced e.m.f. in a conductor depends on the
Increasing the field or increasing the current will decrease the force on the conductor.
Increasing the field or increasing the current will decrease the force on the conductor.
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
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
A moving magnetic field will produce the same effect as a conductor that is moving.
A moving magnetic field will produce the same effect as a conductor that is moving.
Which of the following circuit elements will oppose the change in circuit current?
Which of the following circuit elements will oppose the change in circuit current?
A conductor 2 meters 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
A conductor 2 meters 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
A crack in the magnetic path of an inductor will result in
A crack in the magnetic path of an inductor will result in
An open coil has
An open coil has
Mutually inductance between two magnetically coupled coils depends on
Mutually inductance between two magnetically coupled coils depends on
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
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
The law that the induced e.m.f. and current always oppose the cause producing them is due to
The law that the induced e.m.f. and current always oppose the cause producing them is due to
The polarity of the induced voltage can be determined by using the left-hand generator rule.
The polarity of the induced voltage can be determined by using the left-hand generator rule.
Two 300 uH coils in series without mutual coupling have a total inductance of
Two 300 uH coils in series without mutual coupling have a total inductance of
Higher the self-inductance of a coil,
Higher the self-inductance of a coil,
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns.
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns.
Which of the fpllowing inductor will have the least eddy current losses ?
Which of the fpllowing inductor will have the least eddy current losses ?
The direction of induced e.m.f. can be found by
The direction of induced e.m.f. can be found by
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
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
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
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
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
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
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
Lenz's law is a consequence of the law of conservation of
Lenz's law is a consequence of the law of conservation of
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
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?
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?
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 inductance will be
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 inductance will be
Which circuit element(s) will oppose the change in circuit current?
Which circuit element(s) will oppose the change in circuit current?
The inductance of a coil will increase under all the following conditions except
The inductance of a coil will increase under all the following conditions except
The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is
The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
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
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
Which of the following inductor will have the least eddy current losses?
Which of the following inductor will have the least eddy current losses?
Air-core coils are practically free from
Air-core coils are practically free from
If current in a conductor increases then according to Lenz's law self-induced voltage will
If current in a conductor increases then according to Lenz's law self-induced voltage will
Which of the following is unit of inductance?
Which of the following is unit of inductance?
As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
Reversing the field or the current will reverse the force on the conductor.
Reversing the field or the current will reverse the force on the conductor.
Which of the following circuit element stores energy in the electromagnetic field?
Which of the following circuit element stores energy in the electromagnetic field?
A laminated iron core has reduced eddy-current losses because
A laminated iron core has reduced eddy-current losses because
For a purely inductive circuit which of the following is true?
For a purely inductive circuit which of the following is true?
In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be
In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be
