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

Determine the maximum height the pinball rolls, Let's say I have a pinball ...

Let's say I have a pinball (solid sphere) with a given mass and radius, and it is held back at a certain distance from equilibrium on a spring. The spring constant k is given, and

Determine the self inductance of the coil, What do you mean by transformer ...

What do you mean by transformer ratio? A current of 2A is passed through a coil of 1000 turns to produce a flux of 0.5µwb. Determine the self inductance of the coil.

At what rate would you lose energy, you were to walk briefly in space witho...

you were to walk briefly in space without a spacesuit while far from the Sun (as an astronaut does in the movie  2001 ), you would feel the cold of space --while you radiated energ

High frequency alternating current by a loud speaker, Give reason that ultr...

Give reason that ultrasonics not be produced by passing high frequency alternating current by a loud speaker At these high frequencies, inductive reactance is so high where is

Describe the working of ultrasonic pulse echo system, Describe the working ...

Describe the working of ultrasonic pulse echo system. The working of ultrasonic pulse echo system: The ultrasonic pulse echo system is utilized to detect flaw, estimate the

Inertia in a pile of books, Inertia in a pile of books Stack up a pile ...

Inertia in a pile of books Stack up a pile of books. Grasp hold of the single at the bottom of the pile and give it a quick jerk. Can you delete it without upsetting the whole

Explain displacement, DISPLACEMENT: The change in the position of a bod...

DISPLACEMENT: The change in the position of a body from its starting position to its final position is known as displacement. It is denoted by d ?.

What is joule cycle, What is Joule Cycle? Find the efficiency of the J...

What is Joule Cycle? Find the efficiency of the Joule cycle, consisting of two isobars and two adiabats.  Presume that the heat capacities of the gas C p and C v are constan

Making an observation nest for ants, Making an observation nest for ants ...

Making an observation nest for ants An observation nest for the study of the life story of ants can simply be made as follows. Make a wooden U from three 30 cm lengths of w

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