1).Due to this self-inductance, when the current in the coil is increased, the self-induced e.m.f. In this topic, you study Self Inductance.A coil (or a circuit) in which a change of current causes an emf of self induction to be induced within the coil itself is said to have self-inductance, or frequently, just inductance (Fig. Inductances are measured with an LCR.This property of the coil only opposes the changing current (alternating current) and does not affect the steady current that is (direct current) when flows through it.
In this context, the following points are worth noting: Its length and the cross-sectional area) and the relative permeability of the surrounding medium. The reluctance in turn depends upon the dimensions of the coil (i.e.
If the conductor is bent back on itself, the field due to the current flowing in one direction neutralizes that due to current flowing in opposite direction. The inductance being dependent on number of turns, the inductance of a coil is greater than the inductance of a straight conductor of the same length. As such, the inductance of a coil also varies with the current. In the case of an iron-cored coil, the relative permeability of iron is not constant but varies with the current due to saturation effect. Hence, the inductance of a coil with the core of air or other non-magnetic material is always constant and independent of the value of the current. For air or other non-magnetic materials, relative permeability is always constant (μ r = 1).
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