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

Heisenberg''s uncertainty principle of position & momentum, Q. Heisenberg's...

Q. Heisenberg's uncertainty principle of position & momentum. Describe an experiment to study the uncertainty of position & momentum.   Heisenberg's Uncertainty Principle : It

Determine the natural frequency of system, A mass of 6 kg lies on a smooth ...

A mass of 6 kg lies on a smooth horizontal table, and is attached by a spring to a fixed point, as shown in the figure below. The spring has a stiffness of  375 N/m. (a). Determ

Electrical charges, An electron is constrained to the central perpendicular...

An electron is constrained to the central perpendicular axis of a ring of charge of radius 2.2 m and charge 0.015 mC. See Section 22-6. Suppose the electron is released from rest a

Define phase, Phase (Φ) : The amount which express at any instant, the disp...

Phase (Φ) : The amount which express at any instant, the displacement of the particle and it's direction of motion is known as the phase of the particle. If two elements of the

Poisson equation, Poisson equation (S.D. Poisson) It is the differentia...

Poisson equation (S.D. Poisson) It is the differential form of Gauss' law, such as, div E = rho,

Third harmonic- standing waves on a string, Third Harmonic- Standing Waves ...

Third Harmonic- Standing Waves on a String There are a variety of patterns that could be generates through vibrations inside slinky, a string, or rope. Each pattern corresponds

Explain annihilation of matter, What do you mean by thermal neutron? What i...

What do you mean by thermal neutron? What is its importance? What do you mean by annihilation of matter? Given an example

Explain newtons first law, Explain Newtons First Law An object will rem...

Explain Newtons First Law An object will remain at rest or move with constant velocity until acted upon by a net external force. (A non-accelerating reference frame is known

No.of electrons in outermost orbt element of atomic number, Number of elect...

Number of electrons in the outermost orbit of the element of atomic number 15 is: (1) 1        (2) 3        (3) 5        (4) 7 Ans: 5

Diesel and flat car- inelastic collision, Diesel and Flat Car The anima...

Diesel and Flat Car The animation below portrays the inelastic collision among a extremely massive diesel and a less massive flatcar. Previous to the collision, the diesel is i

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