Inductance Definition and 460 Threads

http://www.youtube.com/watch?v=o0hXYfvnND0 What would happen if the ground was kept in place and the positively charged rod was constantly moved to and away from the electroscope? Would we not have ac current between the Earth and the electroscope? Replace The electroscope with a capacitor...

A series RLC circuit connected to a 100-V 60-Hz source draws a current of 2.5 A. The measured power factor for the circuit is 0.7 leading, and the inductive reactive power is 300VAr. Calculate the resistance, inductance and capacitance of the circuit and show the corresponding impedance...

Could anyone help me to find out a book which has detailed explanation(derivations) for the capacitance, inductance of a mictropstrip line. It would be helpful if the book has detailed discusions on fringing fields,(effective width of the ground plane) effective permitivty etc. I have tried...

Homework Statement For one of the problems in my homework it asks to prove that L=μAN^2/length ...i didnt have a problem with that osrt but the second part states a spring is 5cm long and has a diameter of .15 cm with 50 coils...how much self-inductance must you include for it to model as an...

Homework Statement I am supposed to find the circuit design for a first-order low-pass filter. The filter must be made of resistors and capacitors only (no inductances). Furthermore, the output voltage must be measured over a resistor or something in parallel with a resistor. Homework...

Homework Statement This is more to do with an experiment I'm failing terribly at rather than a direct homework question. I could not find the right section to ask this in. Investigate the inductance of inductors with cores of Perspex and Copper using an Anderson's bridge. For Perspex, compare...

The problem I have is the following: Two Coils have a resistance of 25 ohms and an inductance of 20 mH. Coils are mutually coupled with a coefficient of coupling of 0.6. (a) Calculate the voltage input to the first coil to develop a power of 1.6W at a frequency of 1 kHz. with a load of 55<-40...

Homework Statement See attached. Homework Equations The Attempt at a Solution (5+j8)I1-j6I2-j3I2-j3I1*2=magnitude(12) degrees (60) (5+j2)I1-j9I2=magnitude(12) degrees (60) j2I2-j6I1-j3I1=0 -j9I1+j2I2=0 I put these equations into mathematics software and get the answers...

Homework Statement A solenoid is wound with a single layer of insulated copper wire of diameter 2.100 mm and has a diameter of 3.000 cm and is 1.900 m long. Assume that adjacent wires touch and that insulation thickness is negligible. a) How many turns are on the solenoid? Solved...

Homework Statement The ignition coil supplies V=20kV to the spark plugs. The maximum current in primary coil Imax=4.0A. The current is interrupted 100 times/sec by the distributor points. Estimate the mutual inductance M of the primary and secondary coils. Hint: I have to make a...

Hi, I was reading some text and came across this problem, the problem is also mentioned in this link from Wiki: http://en.wikipedia.org/wiki/Inductance#Self-inductance They said that it is because the 1/R now becomes infinite, this is what I'm confused about. From my understand, there would be...

Hello everyone, I am trying to make a coil with the exact specs as the original. I have all the info I need except the actual core material used. I have all the measurements of the core and coil including: Wire gauge, # of turns and turns per layer,Bobbin dimensions, inductance without the...

any help would be much appreciated i am trying to calculate the inductance and impedance of a unknown air cored inductor. over a set frequency range (1600hz - 2700hz in 100hz increments) using a series RL circuit tools scope multimeter frequence generator Amplifier 1ohm 100W metal...

Hello. I am working through the book "Analysis of Electric Machinery and Drive Systems" by Krause. On p.51, the mutual inductance between two windings (a and b) of a 3-phase machine (generator) is calculated. I am struggling to follow the integration performed on eqn 1.5-15 to arrive at eqn...

http://img638.imageshack.us/img638/989/newbitmapimagety.png I am running my loop current equations for this circuit and have. -1+-j6*(I1-I2)=0 -j6*(I2-I1)+j20*I2 +j12*I3=0 (j30-j2+j5+4)*I3+j12*I2=0 But i am being told that the mutual inductance term j12 should be negative in both. My...

Hi I'm doing simulations in preparation for experimental measurements of decoupling capacitor parasitic inductance. I've done simulations of two port measurements, in mentors hyperlynx, of parallel capacitors on small power planes. These have given me s2p files that I've converted to...

Hi All, I have a component that at 1 Khz has 100 mH Inductance and 100 Ω resistance. I know that at higher frequencies which I will need to run the circuit, these values won't be the same anymore. Is there any way, mathematically, to figure out what those values would be at higher...

Friends: I would like to verify my understanding of mutual induction. Coil 1: n1 turns per unit length, radius is r1, has a current I1 Coil 2: n2 turns per unit length, radius is r2, has a current I2 (in the same direction as I1) r1 > r2. Coil 2 is inserted inside Coil 1. What is the...

Friends: Lets say you have a conductor that is made of two components - an inner core of steel and an outer layer of aluminum (ACSR). Is there mutual inductance between the steel and the aluminum? Every example of mutual inductance I have seen requires that an insulated wire be wrapped around...

Homework Statement The Attempt at a Solution Just was hoping someone here would be able to help me with the circuit above. I wanted to ensure that I analyzed it properly. I applied Ohm's Law to determine the initial current through the inductor. i(initial)=-16V/2.2kΩ=-7.27 mA...

If we know the inductance of an iron-cored coil to be 200mH, and we remove the iron core such that the core is now air, how exactly can we determine what the new inductance is with just this information? I played around with the equation for inductance, however, I could not seem to get it...

Homework Statement The graph below shows the voltage across a 820 mH inductor vs. time. Find the current (Ix), the power delivered (Px) and the energy stored (Wx) at time tx = 9 μs. The attempt at a solution I tried adding up the areas of the rectangles up to tx and multiplying it by...

Hello. I'm am studying topics related to inductances and Faraday's law and I'm having hard time at PICTURING situations. Mental representations. So I propose an example of something I don't understand and we may go on from there. Consider circuit consisting of an inductance and an AC source...

When an inductor is oscillated at it's resonant frequency it becomes a parallel LC circuit (Tank circuit). At this frequency the circuit has a theoretical infinite impedance. However, due to the resistance of the inductor energy is dissipated. The power supply provides a small current (equal...

voltage across inductance ?? having real problems with this one, I think i got the 1st pat using w=1/(lc)^1/2 Can someone help me please?

In an a.c.circuit containing only inductance, for example, it is said that the current is lagging behind emf by 90 degree. We can understand this that when the emf is zero,the current is at its negative maximum and when the emf reaches its positive maximum, the current becomes zero and so on...

Hi all! I tried to make an inductor. Naturally, I am not sure about it's inductance value. I made an LC series circuit on a bread board. I am using a oscilloscope and an a function generator to find the value of L during the resonant frequency. Channel one goes from function generator...

im trying to understand the mutual inductance in induction motor operation...How the mutual inductance occur in induction motor? what it does with the rotating magnetic field?

I am wondering, In a flyback inductor used for a boost converter, what inductance would be required to produce 5kV across the flyback inductor in 1mS with a current of 10mA? I know the formula would probably be V=L di/dt but I'm not sure how to rearrange it to get the correct answer.

Hi all, I'm studying computer aided design at university but i have to complete an electronics module. My knowledge is extremely basic and my lecturer 'does not have the time to go through basic physics' so i need a little help. I have been asked to... 'Design a coil which has a given...

Homework Statement A 50 mH inductor, a 10 microF capacitor and a 200 ohm resistor are connected in parallel. A voltage of 10 v at 1kHz is applied. what is the magnitude of current that flows?Homework Equations The Attempt at a Solution I recognised this would be a problem where i would need...

Homework Statement Consider two rectangular loops. An outer and inner loop. Assign outer loop a length a and width b. Assign inner loop length c and width d. Apply a current to the outer loop. Determine an expression for the mutual inductance between the loops. Homework Equations...

A solenoid has a radius R, length L, with N turns and carrying a current I. If a cylindrical rod with permeability μ and radius R/2 is inserted inside the solenoid, what is the inductance of solenoid?

This problem is tougher than I though and I'm stuck on a couple of things. Homework Statement There are 2 inductors, a DC power source, 2 resistors, and a switch. The circuit looks just like the image I've attached, except it will have a switch on the left of the first resistor and the...

Im working with building a reluctance motor and I've posed a problem to myself that i cannot answer without questioning some long accepted facts about the inductance of a solenoid. The simple solenoid and toroidal solenoid are two shapes that seem to have simple equations for calculating the...

Homework Statement Suppose a fixed distance separates the centers of two circular loops. What relative orientation of the loops will give the maximum mutual inductance? What orientation will give the minimum mutual inductance? Homework Equations none The Attempt at a Solution...

Homework Statement An inductance of 3 mH has the following voltage waveform: for 0<t<2\text{ }ms, v=15\text{ }V; for 2ms<t<4ms, v=0; and for 4\text{ }ms<t<6\text{ }ms, v=-30\text{ }V. Assuming i(0)=0, find the current at time (a) 1 ms, (b) 4 ms, (c) 5 ms. Ans. (a) 5 A; (b) 10 A; (c) 0Homework...

In the flyback inductor equivalent circuit and also in general, why is magnetizing inductance represented in parallel to the actual inductance? We can have just the Magnetizing inductance in series with the leakage inductance. Also, in flyback converters why does the secondary voltage get...

Find the inductance per unit length of parallel plate tx line width = w and space =d between the two plates. w>>d. My question is whether the total inductance is twice the calculate inductance because total inductance is the sum of inductance of the top and the bottom plate. But it seems all...

Homework Statement http://nplq1.phyast.pitt.edu/res/csm/csmphyslib/type66_inductance/PairOfCoils.jpg Coil A is a large 400 turn circular coil of radius 91.0 cm. Circular coil B has 160 turns, a radius of 2.0 cm and is located L = 92.0 cm from coil A along the same axis. The planes of the two...

Hey Folks. I am currently designing a buggy which tracks an inductive wire using two inductor sensors. The wire is carrying 20Vac pk-pk , 125ma at 10kHz. I have designed a sensor circuit which has a ratio of 2:1 ie it outputs a waveform of 10Vac pk-pk (assuming 100% mutual inductance). This is...

what is the value of e.m.f acting upon charged point particle situated at the centre of a circular coil carrying a changing current

Homework Statement A 0.100m long solenoid has a radius of 0.05m and 15000 turns. The current in the solenoid changes at a rate of 6.0 A/s. A conducting loop of radius 0.0200m is placed at the center of the solenoid with its axis the same as that of the solenoid. Determine the mutual...

Homework Statement hi, i just have few questions on how to make a 30mH-inductor (solenoid). I have an enameled copper wire which i will wrapped into a 7-inch rebar having 12mm diameter. In order to determine the number of turns, i made some calculations:Homework Equations L=(uAN^2)/dThe Attempt...

The energy of an RLC circuit decreases by 1.00% during each oscillation when R=2.00 ohms. If this resistance is removed, the resulting LC circuit oscillates at a frequency of 1.00 kHz. Find the values of inductance and capacitance.

Is there a difference in inductance of an inductance with magnetic material whether it is magnetized or not. Meaning is there an increase of inductance if the core has been magnetized ( become magnet) vs the same material but not magnetized? Does magnetization increase the \mu of the material?

the problem given is: A circular loop of wire can be used as a radio antenna. If a 22.0-cm-diameter antenna is located 2.20km away from a 95.0-MHz source with a total power of 55.0kW, what is the maximum emf induced in the loop? (Assume that the plane of the antenna loop is perpendicular to the...

I'm not really sure where to put this question. I'm trying to project current output of a ciruit I am building. Suppose that an initial current which pulsates according to time, t, is given as I = sin(wt)+1. I have two inductors which share the same core in close proximity, the first having...

I am confused on the formulas of inductance. In "Fields and Waves Electromagnetics" by David Cheng: L = \frac{\Lambda}{I} \;\hbox{ where }\; \Lambda = N \Phi N is the number of turns on the inductor, \Lambda is called flux linkage and \Phi = \int_S \vec B \cdot d\vec l...

Hello, I need to construct an AM radio's RC circuit that: 1. resonates to frequency f= 580 Hz 2. has a maximum current of I = 0.2 A 3. the capacitor has a maximum potential energy U = 2 x 10^-5 I need to find: The inductance and capacitance (L & C) of this RC circuit. Please help...