Inductors in dc circuits, Physics

Inductors in dc circuits:

If it is required to increases the value of inductance in a circuit, then two or more inductors may be connected in series.  The total inductance then depends on the sum of individual inductances and the mutual coupling between them.

With no mutual coupling:

          LT  =  L1  +  L2  etc

If the coils are positioned so that the mutual induced emf's in each coil aid the self induced emf's then the coils are said to be series aiding, and 

          LT  =  L1  +  L2   +  2M

If the coils are positioned so that mutually induced emf's in each coil oppose the self induced emf's, the coils are said to be in series opposing, and

          LT  =  L1  +  L2   -  2M

Thus if the position of L2 reference to L1 can be reversed, then the total inductance will vary between:

          LT  =  L1  +  L2   +  2M

and   LT  =  L1  +  L2    -  2M

giving a total variation of 4M.

A device which will achieve this is called variometer.  It consists of two coils located one inside the other.  The outer coil (stator) is stationary whilst the inner coil (rotor) is capable of rotation through 180 degrees.  The coils are mutually coupled and connected in series, in one position the rotor field aids the stator field, when the rotor is turned 180º the rotor field opposes the stator field.  Then the coils are at 90 degrees to each other, mutual coupling is negligible.

Posted Date: 9/13/2012 6:23:48 AM | Location : United States







Related Discussions:- Inductors in dc circuits, Assignment Help, Ask Question on Inductors in dc circuits, Get Answer, Expert's Help, Inductors in dc circuits Discussions

Write discussion on Inductors in dc circuits
Your posts are moderated
Related Questions
how faster ultrsonic waves will travel in solids.

Gray; Gy (after L.H. Gray, 1905-1965): The derived SI unit of absorbed dose, described as the absorbed dose wherein the energy per unit mass imparted to the matter through ion

A flow rate of 200 gpm of oil with u=1.5 x 10 -3 lb-sec/ft2 and p=1.7 slug/ft3 occurs in a 4-in pipe. Determine the Reynolds number. Classify the flow as laminar or turbulent. Wha

a)      You are travelling in a rocket in a totally vacant universe. The rocket is travelling at 100 m.s -1 and accelerates at 10g for 3 minutes. How fast are you travelling at th

What is Heat? We now have several scales for measuring temperature, but first let's ask, “Is temperature the same as heat?” If I add heat to a pot of water, the water's temperatu

The heat-rejection system for a condenser of a steam power plant is to be designed for minimum first plus pumping cost. The heat-rejection rate from the condenser is 14MW. The foll

Choroid: Inside the sclera it is thin, non transparent or opaque. Its front part of iris there is an aperture known as the pupil which control amount of light entering the eye.

Electromagnetic waves: Electromagnetic waves with different ranges of frequency constitute an electromagnetic spectrum. Electromagnetic waves are transverse in nature. Visible

Q. Illustrates the evidence is there supporting the Big Bang theory? Answer:- In brief the universe is expanding. Each of the galaxies we have observed that are utmost awa

A person is determining the description of the image formed by a converging lens by implies of a ray tracing diagram. The person has gotten so far as drawing one principal ray. Wha