The property of coil by which a counter EMF is induced in it. when the current through the coil changes is known as Self-inductance.
Cuts the magnetic flux
As per faraday’s law of electromagnetic induction, an EMF is induced in a conductor whenever it Cuts the magnetic flux.
Inductance stores energy in the electromagnetic field.
When more length for the same number of turns is provided
The inductance of a coil will increase under all the following conditions excepts When more length for the same number of turns is provided.
Longer the delay in establishing steady current through it
Higher the self-inductance of the coil 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 Decrease.
Infinite resistance and Zero inductance
An open coil has Infinite resistance and Zero inductance.
Both the number of turn and core length of an inductive coil are doubled. Its self-inductance will be Doubled.
Produce current opposite to the increasing current
If current in a conductor increases then according to Lenz’s law self-inductance voltage will Produce current opposite to the increasing current.
The direction of induced e.m.f can be found by Lenz’s law.
Both (a) and (b)
Air-core coils are practically free from hysteresis losses and Eddy current losses.
Rate of change of flux-linkages
The magnitude of the induced EMF in a conductor depends on the Rate of change of flux-linkages.
All of the above
Mutually inductance between two magnetically-coupled coils depends upon Permeability of the core, The number of their turns and Cross-sectional area of their common core.
The laminations are insulated from each other
A laminated iron core has reduced eddy-current losses because The laminations are insulated from each other.
The law that the induced e.m.f and current always oppose the cause which produced it, is discovered by Lenz.
Coulomb/volt ampere is not a unit of inductance.
In case of an inductance, current is proportional to Magnetic field.
Actual power of the circuit is zero
The unit of inductance is Henry.
Morningexam.com provides Electrical MCQs, Notes, Exam Materials and Online Test series for your Competitive exams. You can also get Current Affairs, GK, Aptitude, Verbal Ability, and Reasoning questions. Best for ITI and Diploma Students.
Have questions, comments or just want to say hello: