Which type of inductor is used for tuning circuits like radio?

Toroidal core

Variable core

Air core

Ferrite core

Correct Answer : Option (B) : Variable core

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Which type of device consists of a coil with a moveable iron core?

relay

solenoid

armature

reed switch

Correct Answer : solenoid

Electricity may be generated by a wire_________

carrying current

wrapped as a coil

that has neutral domains

passing through a flux field

Correct Answer : passing through a flux field

The coefficient of coupling between two air core coils depends on ____________

Self inductance of two coils only

Mutual inductance between two coils only

Mutual inductance and a self inductance of two coils

None of the above

Correct Answer : Mutual inductance and a self inductance of two coils