Inductors in dc circuits, Physics

Assignment Help:

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.


Related Discussions:- Inductors in dc circuits

Experiment of the path of a projectile, Path of a projectile The appara...

Path of a projectile The apparatus below can be used to indicate the independence of the horizontal and vertical velocities of a projectile. The projectile is a metal ball, and

Michelson interferometer, How will you determine the difference in the wa...

How will you determine the difference in the wavelengths of 2D lines of sodium light buy Michelson Interferometer

Explain coherence, Define coherence and explain temporal and spatial cohere...

Define coherence and explain temporal and spatial coherence. Show that visibility is a maxim of coherence. Define the 'Q' factor for a spectral line. Explain coherence length and c

Newton law, what is newton first law of motion

what is newton first law of motion

Explain di - electric, Di - Electric: The insulator used among the plat...

Di - Electric: The insulator used among the plates of a capacitor is known as Di-electric.

What is neutral temperature, Q. What is neutral temperature? Maintain ...

Q. What is neutral temperature? Maintain the temperature of the cold junction constant the temperature of the hot junction is gradually increased. The thermo emf increase to a

Determine the wavelength of sound wave, Enrique Iglesias belts out a high-C...

Enrique Iglesias belts out a high-C (1024 Hz) from the deck of his yacht. What is the wavelength of this sound wave in the surrounding air? As the sound wave enters the ocean below

Show how devaluation affects an economy, Q. Using a figure, show how devalu...

Q. Using a figure, show how devaluation affects an economy. Answer: While a currency is devalued from E 0 to E 1  the stability shifts from point 1 to 2. Both money supply and

Disk light second in circumference were to spin at 60 rpm, Q. What would oc...

Q. What would occur if a disk one light second in circumference were to spin at 60 RPM? Answer:- 60 revolutions for each minute is one revolution per second. 1 light se

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd