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
Relativity principle: The principle, employed through Einstein's relativity theories, that the laws of physics are the similar, at least qualitatively, in all of frames. That

Can you please, explain what is ''n'' in this equation: Q=ne?

Method of Making magnet: There are two types of making magnets. Single Touch Method: a. In this method a bar magnet is rubbed on a hard steel bar. b. The magnet is k

The effects of open circuits: An open circuit is essentially a break in the circuit. An open circuit in a series circuit will prevent the flow of current through the circuit. W

when dispersion is happening from a prism, the colors are separated out. do each of these colors move with different velocities to keep frequency constant? practically is it possib

Magnetic susceptibility of copper is 0.5 Calculate the magnetic moment per unit volume of copper, when it is subjected to a magnetic field of G. If the material is in the crystalli

How does the elevation and air pressure affect the boiling point of water? The only factor that explains the boiling point of water at any altitude is the barometric pressure (

Q. Illustrate What is the geocentric? Answer:- It is science where the earth is the midpoint of the solar system and the other planets and the sun revolve around the earth

What is the difference among a fiber optics manufacture and a fiber optics system manufacture? It is a question that would sound silly in other industries although not in this

Planck constant; h: The fundamental constant equivalent to the ratio of the energy of a quantum of energy to its frequency. It refer to the quantum of action. This contains th