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

Why does heat makes matter to expand, Q. Why does heat makes matter to expa...

Q. Why does heat makes matter to expand? Answer:- Water contracts as it cools similar to all other liquids until it reaches a temperature of about 4 degrees Celsius at whi

General help with physics 10, so we just started physics in grade 10, and i...

so we just started physics in grade 10, and i dont understand to much of it.. could you help me better understand it? and help me understand what i should expect?

Kinematics, A particle moving in a straight line with constant accelaration...

A particle moving in a straight line with constant accelaration is having initial velocity of 10 m/s. After some time, the velocity becomes 30 m/s. Find the velocity of particle at

Name the particles that flow towards the cathode, A high voltage applied to...

A high voltage applied to a gas discharge tube having neon gas at very low pressure causes a current to flow through the tube.   Which particles that flow towards the cathode?

Couple, Ask question how many types of couple are there?#Minimum 100 words ...

Ask question how many types of couple are there?#Minimum 100 words accepted#

Determine the power supplied to the load, A single-phase transformer has a ...

A single-phase transformer has a voltage ratio of 6:1 and the h.v.winding is supplied at 540V. The secondary winding gives a full load current of 30A at a power factor of 0.8 l

Determine the acceleration of gravity, When a person stands on a scale in a...

When a person stands on a scale in an elevator at rest, the scale reads 800 newtons. When the elevator is allowed to fall freely with acceleration of gravity, the scale reads o

Determine the magnetic field strength, A coil of 300 turns is wound uniform...

A coil of 300 turns is wound uniformly on a ring of non-magnetic material. The ring has a mean circumference of 40cm and a uniform cross-sectional area of 4cm 2 . If the current in

Changes of resistance with temperature, Changes Of resistance with temparat...

Changes Of resistance with temparature: The resistance of all materials changes with changes in temperature.  The resistance of all pure metal increases with temperature.  The

Copper : properties, Copper   Atomic number ...

Copper   Atomic number 29 Symbol Cu Atomic weight 63.546 Discovery Cu has

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