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The property of coil by which a counter e.m.f. is induced in it when the current throughthe coil changes is known asThe property of coil by which a counter e.m.f. is induced in it when the current throughthe coil changes is known as
The answer is:
A. selfinductance


As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductorwhenever itAs per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductorwhenever it
The answer is:
C. cuts magnetic flux


Which of the following circuit element stores energy in the electromagnetic field ?Which of the following circuit element stores energy in the electromagnetic field ?
The answer is:
A. Inductance


The inductance of a coil will increase under all the following conditions exceptThe inductance of a coil will increase under all the following conditions except
The answer is:
A. when more length for the same number of turns is provided


Higher the selfinductance of a coil,Higher the selfinductance of a coil,
The answer is:
D. longer the delay in establishing steady current through it


In an iron cored coil the iron core is removed so that the coil becomes an air cored coil.The inductance of the coil willIn an iron cored coil the iron core is removed so that the coil becomes an air cored coil.The inductance of the coil will
The answer is:
B. decrease


An open coil hasAn open coil has
The answer is:
B. infinite resistance and zero inductance


Both the number of turns and the core length of an inductive coil are doubled.Its selfinductance will beBoth the number of turns and the core length of an inductive coil are doubled.Its selfinductance will be
The answer is:
B. doubled


If current in a conductor increases then according to Lenz's law selfinduced voltage willIf current in a conductor increases then according to Lenz's law selfinduced voltage will
The answer is:
C. produce current opposite to the increasing current


The direction of incViced e.m.f. can be found byThe direction of incViced e.m.f. can be found by
The answer is:
B. Lenz's law


Aircore coils are practically free fromAircore coils are practically free from
The answer is:
C. both (a) and (b)


The magnitude of the induced e.m.f. in a conductor depends on theThe magnitude of the induced e.m.f. in a conductor depends on the
The answer is:
D. rate of change of fluxlinkages


Mutually inductance between two magneticallycoupled coils depends onMutually inductance between two magneticallycoupled coils depends on
The answer is:
D. all of the above


A laminated iron core has reduced eddycurrent losses becauseA laminated iron core has reduced eddycurrent losses because
The answer is:
B. the laminations are insulated from each other


The law that the induced e.m.f. and current always oppose the cause producing them isdue toThe law that the induced e.m.f. and current always oppose the cause producing them isdue to
The answer is:
B. Lenz


Which of the following is not a unit of inductance ?Which of the following is not a unit of inductance ?
The answer is:
B. Coulomb/volt ampere


In case of an inductance, current is proportional toIn case of an inductance, current is proportional to
The answer is:
B. magnetic field


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 ?
The answer is:
B. Inductance


For a purely inductive circuit which of the following is true ?For a purely inductive circuit which of the following is true ?
The answer is:
C. Actual power of the circuit is zero


Which of the following is unit of inductance ?Which of the following is unit of inductance ?
The answer is:
B. Henry

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