Inductance Definition and 460 Threads

Homework Statement A motor has both resistance and inductance. A motor rated at 1 hp input operating at 240 V draws 4 A of current because a. power is lost due to resistance b magnetic saturation robs power c. inductance does not consume power d. friction in the bearings of the motor e...

Homework Statement A mutual inductor consists of two coils X and Y arranged so that one quarter of the magnetic flux produced by X links with Y. When X is used as the primary coil and Y as the secondary, the mutual inductance is M. What is the mutual inductance when Y is used as primary coil...

Mutual inductance as a psuedo-capacitor? 1. I am testing how reduced the mutual inductance btwn two parallel ring-shaped inductors is when a material is placed btwn them. The primary coil is connected to an AC generator in series with an ammeter (on the order of mA), and the secondary in...

Hi, I would like to ask a question about Mutual Inductance and Transformer. Suppose I have two coils N1 and N2, where N1 is the primary coil and N2 is the secondary coil that is connected in series with some resistance Rx. If I place a voltage V1 across the primary coil, the output voltage V2...

Homework Statement An inductor has the form of a coil with 2074 turns and a diameter of 1.9 mm . The inductor is placed in a magnetic field perpendicular to the plane of the coil and increasing at a rate of 0.48 T/s . The current in the inductor is zero at t = 0, and then increases to 6.9...

Ok so i understand that after a switch in a circuit is closed for awhile the inductor acts like a battery, however, what happens after the switch is opened after being closed for awhile. A review question asks whether the energy: - is converted to sound and spark - remains stored in the...

Hi, when summing the votages when using Kirchoff's voltage law around some loop, why do anywhere they take L(dI/dt) as the voltage fall on the inductance (if we sum the voltage in the current direction)? If I understand well , if there is a current in some direction, the induced voltage...

I need the inductance of a simple ferrite core wire-wound inductor. It's not clear how to get than in 2D Maxwell SV. The core is one material (ferrite), the windings are another (Copper). If you group them, the group must be of a single material, so no good. If you don't group them...

Homework Statement Hello I am studyin for a test and I just wanted to make sure I understand this basic idea... All C's are 5 micro F All L's=2H Homework Equations The Attempt at a Solution For the I came to the conclusion that Ceq=5 micro F the ones circled in blue...

i am having a doubt that when we find a expression for mutual inductance we say that flux change in primary coil induces emf in secondary coil. but why change in flux doesn't induce any current in primary coil also.

http://i27.tinypic.com/23r02mg.jpg I CANT UNDERSTAND FROM WHERE THEY GET THE FORMULA IN THE SOLUTION

http://i26.tinypic.com/250tkyh.jpg the formula for magnetic field is like they show but its not divided by l like they did i can't see a reason why they present it that way ??

M_{12}=\frac{N_2\phi _{12}}{I_1} i need to remmeber it but i can't see the logic of the formula ??

Ive made an experimental generator built loosely of the Faraday flashlight technology. Rather than a linear air coil using a reciprocating magnet I've made a toroidal coil and added magnets on the outside of the toroidal to coerce unidirectional movement of the interior magnets that match the...

Hi, I recently performed a stator core loop test and am now in the process of capturing the setup and results in a report. A short explanation of the test setup and execution: A cable is wrapped around the core and energized, which induces a magnetic flux through the core. The core...

Homework Statement The mutual inductance between two coils is 0.0100 H. The current in the first coil changes uniformly from 2.7 A to 5.0 A in 0.160 s. If the second coil has a resistance of 0.600 Ω, what is the magnitude of the induced current in the second coil? Please show stepsHomework...

I'm looking over some equations for the output of a flyback transformer (essentially the same as for a buck-boost converter) and I notice that as long as the flyback operates in the continuous mode, the inductance doesn't enter into the equation. Of course since no inductor is ideal, there must...

The equation widely used to calculate the force on a projectile in an electromagnetic launcher, more specifically a railgun, is: F = 0.5 * L' * I^2 where: --> F is the force in Newtons --> L-prime is the inductance gradient of the rails in henries/meter (H/m) --> and I is the current...

Homework Statement A inductor that has a resistance of 80 k-Ohms is connected to an ideal battery of 84V. 0.8 milliseconds after the switch is thrown the current in the circuit is .5355 mA. Calculate the Inductance. answer in units of H. Homework Equations V = L(I/t)? The Attempt...

Hi Friends, :smile: Two particularly abstract queries have surfaced in my mind (this seems to be a recurring problem with me! ) :biggrin: CASE 1 :- Infinite Inductance Let us consider an 'ideal' solenoid coil (zero resistance, pure inductance). It is connected to an AC supply of say...

The images tell it all. Please help someone. http://image.cramster.com/answer-board/image/200941884006337564080009162509346.jpg on this diagram, the expression IL(t) should read I(t). http://image.cramster.com/answer-board/image/2009418845296337564112974787505740.jpg

If there is a circuit consists of a long thin conducting shell of radius a and a parallel return wire of radius b on axis inside. If the current is assumed distributed uniformly throughout the cross section of the wire, must we calculate mutual inductance?

Homework Statement What inductance must be used with a 4.0 µF capacitor to produce a frequency of 10 kHz, which is near the middle of the audible range of frequencies? Homework Equations w = 2pi*f/C=1/(sqrt(T*C)) --->angular fequency T= 1/f The Attempt at a Solution T= 2pi/w...

Hi, I am en electrical engineering grad student and I have to solve an equation to calculate the mutual inductance between an antenna and a micro-inductor. I think it is a Bessel equations but I don't know how to solve. M(a,b,d)=(1.45x10^-8)*integral(J1(1.36x)*J1(0.735x)*exp(-x-13.6))dx...

Find the mutual inductance (H) of the solenoid and coil shown below. The solenoid has 5263 turns per meter and an area 112 cm^2, and the coil has 230 turns and an area 19 cm^2. I know that mutual inductance = (N1 Φ1)/ I2 but I have no idea where to begin since they don't provide the...

Homework Statement Homework Equations Φ = M*I Biot-Savart law Ampere's law The Attempt at a Solution I have the formula Φ = M*I, which means that to find the mutual inductance I simply need to find the magnetic flux through the top circuit due to the current in the bottom...

I have a few statements that I have to discern whether they are true or false and I am down to my last guess and am completely stumped. 1. No EMF will be generated by a coil rotating inside a magnetic field if the axis of rotation is perpendicular to the field. 2. In an electrical...

I'm having a bit of trouble getting the right answer for a problem in my electrical engineering textbook. The question is: At t=0, the current flowing in a 0.6H inductance is 8A. What constant voltage must be applied to reduce the current to 0A at t=0.4s. I'm using the equation...

help me please! [Inductance] Homework Statement an experiment to determine the inductance and internal resitance of an inductor in a series LCR circuit. I am proved with an a.c. power supply, an inductor, a capacitor substitution box, a resistor and an a.c. voltmeter Homework Equations...

I have to make a solenoid to operate some device. Can anybody let me know what formula to use to calculate number of turns for a solenoid wound on some metal. I also want to calculate the force. Does this formula works B = uourNI/L & F = ILB

I am studying the relationship between transmission speed in a Transmission Cable and the temperature of the cable. This speed is given by (as per discussion in the Feynman lectures) v=\frac{1}{\sqrt{LC}} where L is the inductance per unit length C is the capacitance per unit length...

Homework Statement How will a coil's self inductance change if you unwind it and then re-wind half of the length of wire into a coil with the same diameter but with half of the number of turns? The answer is that it will decrease by 1/4, but I don't understand why it isn't 1/2 instead...

Inductance & magnetic flux problem -- please help Homework Statement The magnetic field of a place on Earth has strength 55 microTesla and is tilted 60 degrees below horizontal. A 200 turn coil with diameter 4cm and resistance 2 ohms is connected to a 1 microFarad capacitor. The coil is...

Homework Statement Give a definition of (self) inductance. Suppose a battery, which supplies a constant EMF ϵ_0 is connected to a circuit of resistance R and inductance L at t = 0. Find an expression for the current as a function of time. Homework Equations V = IR V =...

a. The reactance of an inductor is 100 ohms at 2kHz. What is the inductance of this inductor?? b. At what frequency is the reactance of a 3.5-mH inductor equal to 10 ohm? I am not even sure what equations to use for these two questions. I know that for a the inductive reactance equation...

hello Forum, why is the voltage on a capacitor not instantaneously following the change in the current (which follows the change in the generator source voltage)? Where does the delay come from (90 degree phase retardation)? WE can think of the capacitor as having some inertia. The same...

Homework Statement An AC generator produces a voltage of 230<45º volts. It is connected across an impedance of 17.4<-33º ohms. The supply frequency = 50Hz I got my assignment back and this question wrong, maybe you can guide me, please because I’m not sure entirety. Help is...

Homework Statement An AC generator produces a voltage of 230<45º volts. It is connected across an impedance of 17.4<-33º ohms. The supply frequency = 50Hz I got my assignment back and this question wrong, maybe you can guide me, please because I’m not sure entirety. Help is...

I'm trying to setup a DC filter to remove noise that's is entering an amplifier circuit. It's just standard line current noise at 60Hz. I can't figure out how on the other hand how to calculate the necessary values to pick an inductor that will do the job. The DC power in is 16V @ 4A, DC...

I'm having some trouble calculating the values I need for a capacitor and inductor for a passive filter. The values that I know to use are current, voltage and frequency. But I have a voltage <1 volt and a frequency of 60Hz but no current. Can someone help me figure out what value of capacitor...

inductance, flux, capacitance 1. Homework Statement The magnetic field at one place on the earth’s surface is 55 μT in strength and tilted 60° down from horizontal. A 200-turn coil having a diameter of 4.0 cm and a resistance of 2.0 Ω is connected to a 1.0 μF capacitor rather than to a...

Homework Statement The magnetic field at one place on the earth’s surface is 55 μT in strength and tilted 60° down from horizontal. A 200-turn coil having a diameter of 4.0 cm and a resistance of 2.0 Ω is connected to a 1.0 μF capacitor rather than to a current meter. The coil is held in a...

Homework Statement A series RLC circuit has a resonant frequency of 6.00 kHz and a resistance of 575 ohms. When connected to an AC power supply that varies the voltage at 8.00 kHz, its impedence is 1.00 kOhms. What are the capacitance and inductance of the circuit? Homework Equations...

1.I don't understand where the J2X2 comes from. Everything else seems fine but why is there a J2x2 CHECK ATTACHED PICTURE THANK YOU

I want to calculate inductance of a system: a solenoid with sphere of different permeability in between. Plz reply... thanks n regards ruhi

wts the practical importance of inductance in dc and ac working? application of ideal current and voltage sources(dint know dey had specific applications till the time i saw dis question in a college paper...i thought dey were just theoretical...)? how does an ammeter measure the rms value...

Homework Statement A square loop made of wire with negligible resistance is placed on a horizontal frictionless table. The mass of the loop is m and the length of each side is b. a nonuniform vertical magnetic field B=B0(1+kx) exists in the region, where B0 and k are constants. The loo is...

Homework Statement Find the mutual inductance between an infinitely long wire and a single loop of wire separated by a distance d. (radius = a) Homework Equations The Attempt at a Solution I've adjusted the magnetic flux density to a coordinate system to make everything easier B =\frac{...

Homework Statement 21. A certain transmission line is constructed from two thin metal “ribbons”, of width w, a very small distance w<<h apart. The current travels down one strip and back the other strip. In each case it spreads out uniformly over the surface of the ribbon. a) Find the...

I have noticed there are different Inductance formula's for a various types of air coils & there design, single layer spiral, flat wound spiral, multilayer etc. My question is for the design of Jumble wound --- Random wound air core coils: What is the Inductance formula for a Jumble...