931. Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?
A. unaffected
B. doubled
C. halved
D. quadrupled
932. 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_____________?
A. increase
B. decrease
C. remain the same
D. initially increase and then decrease
933. As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it_______________?
A. lies perpendicular to the magnetic flux
B. lies in a magnetic field
C. cuts magnetic flux
D. moves parallel to the direction of the magnetic field
934. The inductance of a coil will increase under all the following conditions except______________?
A. when more length for the same number of turns is provided
B. when the number of turns of the coil increase
C. when more area for each turn is provided
D. when permeability of the core increases
935. An open coil has_____________?
A. zero resistance and inductance
B. infinite resistance and zero inductance
C. infinite resistance and normal inductance
D. zero resistance and high inductance
936. The direction of induced e.m.f. can be found by_____________?
A. Laplace’s law
B. Lenz’s law
C. Fleming’s right hand rule
D. Kirchhoff s voltage law
937. 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__________?
A. self-inductance
B. mutual inductance
C. series aiding inductance
D. capacitance
938. Air-core coils are practically free from______________?
A. hysteresis losses
B. eddy current losses
C. both (A) and (B)
D. none of the above
939. If current in a conductor increases then according to Lenz’s law self-induced voltage will____________?
A. aid the increasing current
B. tend to decrease the amount of cur-rent
C. produce current opposite to the in-creasing current
D. aid the applied voltage
940. The law that the induced e.m.f. and current always oppose the cause producing them is due to____________?
A. Faraday
B. Lenz
C. Newton
D. Coulomb
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