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

Angular velocity, Three children are riding on the edge of a merry-go-round...

Three children are riding on the edge of a merry-go-round that is 100 kg, has a 1.60-m radius, and is spinning at 20.0 rpm. The children have masses of 22.0, 28.0, and 33.0 kg. If

Uses of radio isotopes, Uses of radio isotopes: Used in i)Medicine ...

Uses of radio isotopes: Used in i)Medicine ii) Industry iii) Agriculture iv) Meteorology and v) Radio active dating.

Moment calculation, This depends on the arrangement of a beam or column. fo...

This depends on the arrangement of a beam or column. for a simply supported beam with a point load in the centre of the beam Mmax = WL/4 and will occur at centre span W is the lo

What is the measure of the force of gravity on an object, What is the measu...

What is the measure of the force of gravity on an object? Force is the vector product of mass and acceleration: F = ma. Weight is a special case of that formula, where you subs

Experiments with soap films, Some experiments with soap films Make the ...

Some experiments with soap films Make the following forms from wire. Dip the several forms in the thick soap solution and view the films. Dip the wire form with the slider i

Axial position of chair or boat , Why bulky group present at axial position...

Why bulky group present at axial position of chair or boat conformer is less stable compared to equitorial position? Ans) Let the bulky group has a large mass M. suppose it is a

Lens maker equation, what is the physics principle involved in the lens mak...

what is the physics principle involved in the lens maker equation

Show the label pointing in given diagram, Match the name of every item give...

Match the name of every item given in the list below to the label pointing to that item in the diagram. Answer: I guess the only point I desire to stress here is that

Explain three series-connected resistors, A 12V battery is connected in a c...

A 12V battery is connected in a circuit having three series-connected resistors having resistances of 4 Ω,9 Ω and 11 Ω. Verify the current flowing through and the p.d. acr

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