Electromagnetic Induction solved MCQs

Title
The property of coil by which a counter e.m.f. is induced in it when the current throughthe coil changes is known as The property of coil by which a counter e.m.f. is induced in it when the current throughthe coil changes is known as self-inductance mutual inductance series aiding inductance capacitance discuss The answer is: A. self-inductance
As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductorwhenever it As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductorwhenever it lies perpendicular to the magnetic flux lies in a magnetic field cuts magnetic flux moves parallel to the direction of the magnetic field discuss 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 ? Inductance Condenser Variable resistor Resistance discuss The answer is: A. Inductance
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 when more length for the same number of turns is provided when the number of turns of the coil increase when more area for each turn is provided when permeability of the core increases discuss The answer is: A. when more length for the same number of turns is provided
Higher the self-inductance of a coil, Higher the self-inductance of a coil, lesser its weber-turns lower the e.m.f. induced greater the flux produced by it longer the delay in establishing steady current through it discuss 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 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 increase decrease remain the same initially increase and then decrease discuss The answer is: B. decrease
An open coil has An open coil has zero resistance and inductance infinite resistance and zero inductance infinite resistance and normal inductance zero resistance and high inductance discuss 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 self-inductance will be Both the number of turns and the core length of an inductive coil are doubled.Its self-inductance will be unaffected doubled halved quadrupled discuss The answer is: B. doubled
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 aid the increasing current tend to decrease the amount of cur-rent produce current opposite to the in-creasing current aid the applied voltage discuss The answer is: C. produce current opposite to the in-creasing current
The direction of incViced e.m.f. can be found by The direction of incViced e.m.f. can be found by Laplace's law Lenz's law Fleming's right hand rule Kirchhoff s voltage law discuss The answer is: B. Lenz's law
Air-core coils are practically free from Air-core coils are practically free from hysteresis losses eddy current lossesboth (a) and (b) both (a) and (b) none of the abovw discuss The answer is: C. both (a) and (b)
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 flux density of the magnetic field amount of flux cut amount of flux linkages rate of change of flux-linkages discuss The answer is: D. rate of change of flux-linkages
Mutually inductance between two magnetically-coupled coils depends on Mutually inductance between two magnetically-coupled coils depends on permeability of the core the number of their turns . cross-sectional area of their com-mon core all of the above discuss The answer is: D. all of the above
A laminated iron core has reduced eddy-current losses because A laminated iron core has reduced eddy-current losses because more wire can be used with less D.C. resistance in coil the laminations are insulated from each other the magnetic flux is concentrated in the air gap of the core the laminations are stacked vertf-cally discuss 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 to The law that the induced e.m.f. and current always oppose the cause producing them isdue to Faraday Lenz Newton Coulomb discuss 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 ? Henry Coulomb/volt ampere Volt second per ampere All of the above discuss The answer is: B. Coulomb/volt ampere
In case of an inductance, current is proportional to In case of an inductance, current is proportional to voltage across the inductance magnetic field both (a) and (b) neither (a) nor (b) discuss 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 ? Capacitance Inductance Resistance All of the above discuss 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 ? Apparent power is zero Relative power is.zero Actual power of the circuit is zero Any capacitance even if present in the circuit will not be charged discuss 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 ? Ohm Henry Ampere turns Webers/metre discuss The answer is: B. Henry

Title