Inductance Definition and 460 Threads

A circuit contains two inductors of 6.0 mH inductance in series placed in parallel with an inductor of 8.0 mH inductance. After one of the 6.0 mH inductors burns out, the repair person wants to replace all three inductors with one inductor of equivalent inductance. What inductance should she...

[SOLVED] Inductance RL Circuit Calculate the inductance in an RL circuit in which R = 0.300 and the current increases to one fourth its final value in 1.40 s. I tried doing this with V=IR, (I know, the easy way didn't work). I also tried I= V/R(1-e^(Rt/L)) but I don't know what V would...

Hello, I need to measure ONLY a change in inductance of a loop (long wire) which has got resistance about 30-200 ohms. I have tried to build the oscillator according to this schematic : http://ironbark.bendigo.latrobe.edu.au/~rice/lc/ but the problem is it works well with an inductance with...

Is there a theoretical limit to the time constant of an electric motor? I was think, if inductance is simply the conversion of current into the magnetic field, and if increase in resistance limits that current for a given power supply, that having a higher time constant would in effect allow...

Homework Statement A long, solonoidal coil with 2000 turns produces a B field pf 3mT at its center when a current of 1A flows through the coil. If the cross sectional area of the coil is: 2*10^-3 m^-2, and the field is uniform throghout the solonoid, determine the self inductance of the oil...

Does anyone know how to code the following? I have six inductors in series and would like to couple them to one another. i.e. L1 1 2 1u L2 2 3 1u L3 3 4 1u L4 4 5 1u L5 5 6 1u L6 6 7 1u Ideally I'd like to do: K12 L1 L2 0.3 K23 L2 L3 0.4 K34 L3 L4 0.2 K45 L4 L5 0.5 K56 L5 L6 0.4...

An RLC circuit consists of a 48 ohm resistor, a 200 uF capacitor, and an inductor. The current is 2.5 A rms when the circuit is connected to a 120 V/60 Hz outlet. a. What is the inductance? b. What would be the current if this circuit were used in France, where the outlets are 220 V/50 Hz...

A coil has a resistance of 2.10 ohms. The potential difference across the coil is 11.6 V at an instant when the current through the coil is 5.00 A and is decreasing at a rate of 36.0 A/s. What is the coils inductance? I thought i could use the equation X=2pi fL to solve for L.. but i am...

Homework Statement A solenoid is wound with a single layer of copper wire of radius 0.38 cm. The solenoid is 4.5 cm in diameter and 3 m long. What is the inductance of the solenoid per unit length? Assume that adjacent wires touch each other and that insulation thickness is negligible. radius...

1. Inductor & Resistor connected in series A circuit comprising of an Inductor & Resistor connected in series. The values are: R1 resistor Value 680Ω Resistance of the Inductor's Windings: (R of L) 98.2Ω Supply Voltage: 13.2V Circuit Current: 8.1mA Supply Freq: 50Hz Voltage across the...

I read that the unit of inductance is the measure of the time it takes for a current to fully establish itself through the inductor. Is the reason it takes longer in some inductors for the current to establish itself because it creates a greater magnetic flux? Can the henry also tell you the...

Homework Statement For coupled coils in this arrangement (illustration attached), show L_{eq} = \frac{L_1 L_2 - M^2}{L_1 + L_2 - 2M} Homework Equations KVL (mesh analysis) The Attempt at a Solution As you can see, I get to a final answer - which is not exactly the same...

Homework Statement A square, single-turn wire coil L = 1.13 cm on a side is placed inside a solenoid that has a circular cross section of radius r = 2.77 cm, as shown in the figure below. Basically a big circle with a square in the center. The solenoid is 20.0 cm long...

Homework Statement A sinusoidal input is applied to the circuit below. Sketch the waveforms of each of Vr (voltage of resistor), Vc (capacitor) and Vl (inductor) on the one graph with particular attension to the phases (the amplitudes are not important) Hint: Vc is proportional to the...

On wikipedia they give a fairly simply explanation of inductance But on http://www.electronics-tutorials.com/ they give a different definition I don't understand the latter there. Theyre saying any solenoid resists current and the higher the inductance the higher the resistance...

I am a student of the electrical engineering in the university of Munich. I tried to solve a homework but I have some difficulties. I have tried to use different methods. unfortunately, unsuccessfully. I will be very glad if you could help me. in fact I wanted to calculate the mutual...

If I place a pipe filled with WATER inside of a coil and then half filled pipe of same material, does the inducatnec change? Will the change be able to be observed using multimeter? any ideas?

Homework Statement a non inductive resistor passes a current of 20A rms, when connected to a 100v rms supply (50HZ). When connect in series with a pure inductor across a 230v supply the combination draws a current of 15A calculate impedance of the circuit, inductance of the inductor...

inductance of a capacitor-urgent Hi, Please can someone help me quickly with this problem: Use both the flux and energy methods to calculate the inductance per unit length of a pair of parallel, planar conductors of length l , width w, and spacing d . Assume l >> w>> d and neglect...

Homework Statement A 60Hz, 4000A power line passes near your house. You have 200m of wire. The closest you can get to the wire is 20m. Find the maximum power you can extract from the power line. The graphic shows that the loop has to be rectangular with side lengths A and B. Homework...

Hello All, I did a simple mutual inductance experiment recently which involving two coils (5 turns each) in series with a high frequency signal (MHz range) running through them. One coil is directly connected to function generator via a co-axial cable, and the other coil is connected to...

Homework Statement After you measure the self-inductance of a coil, you unwind it and then rewind half the length of wire into a coil with the same diameter but half the number of turns. How does this change the self-inductance? a. It is the same. b. It is doubled. c. It...

hiya guys, I'm having a large amount of trouble with a problem that I've been working through (currently revising for an uncoming exam in electromagnetism, along with a lot of other things). the problem is stated as follows (condensed): coaxial cable - inner cylinder radius a, out cylinder...

In illustrating mutual inductance, there is a primary coil and a secondary coil, which houses an induced current. In applying Lenz’s Law to the direction of the secondary coil’s induced current, the status of the switch must be taken into account. If the switch is closed, does the secondary...

1. i = 10te^(-5t), at what instant of time is the current maximum? first I differentiated i, using the product rule. di/dt = (10e^(-5t)) (1-5) , that's what I got after simplifying, I am pretty certain this is correct. My confusion comes in when taking natural logarithms. if ln(e(^1)) =...

Hello, i wanted to know if there was any difference between self inductance and self flux? thanks

Homework Statement Griffiths problem 7.23 Copute the self inducatnce of the hairpin loop shown in the figure. (neglect contribution from ends since mosto f the flux comes form the straight section) To get a definite answer , assume the wire has a tiny radius epsilon, and ignore any flux...

Homework Statement Coil 1 has L=25mH and N=100 turns. Coil 2 has L=40mH and N=200. The coils are rigidly positioned with respect to each other, and their mutual inductance is 3.0mH. A 6.0mA current in coil 1 is changing at 4.0 A/s. (a)What magnetic flux Phi12 links coil 1 to coil 2, and what...

Hi..I am new here and I am really thankful for any help that I may get :blushing: I am stuck in a problem of mutual inductance. It seems fairly simple, yet I cannot get the correct answer. Two coils are close to each other. The first coil carries a time-varying current given by I(t) =...

An emf self-induced in a solenoid of inductance L changes in time as E=E_0e^(-kt) Find the total charge that passes through the solenoid, if the charge is finite. (Use E_0 for 0, k, and L as necessary.) Now I know that the induced emf is E_L=-L(dI/dt) I'm having a hard time on this...

Hello everyone. I was just wondering is anyone knew an example of a physical device with a)both inductance and resistance b)capacitance, resistance, and inductance. I looked these up on wikipedia and I got that an example for b) would be a radio tuner, is that right? Plus, I can't get a)...Any help?

I'm having some problems with inductances and I want to know on i) what is the value of L at its terminals for t<0... I did an equivalent circuit of the original one when t=0 and this circuit consists of the inductor and R2+R3 in series... I considered t(seconds)<0 and the L acts like a short...

Hi, I'm working on an assigment where I'm given an circuit which contains two op-amps and I am told it is a Gyrator circuit that simulates an inductance. I am required to calculate the values of the resistances and the capacitor in the circuit so that the gyrator has an inductance of...

A fixed inductance 0.66 \mu H is used in series with a variable capacitor in the tuning section of a radio. What capacitance tunes the circuit into the signal from a station broadcasting at 8.11 MHz? Answer in units of pF. I used the equation \omega = 1/ \sqrt LC Solving for C gave me...

I am attempting to pass current from a static part to a moving part via induction across a 1 mm air gap. Once that works I would like to use the current on the moving part to power an IR LED pointed at a mated IR sensor and then receive the resistance value from the IR sensor and pass the...

Hello I am doing some research on non-linear systems, and have come across a equation regarding inductance and I am unsure how it was derived:[p] The inductance of the electromagnet depends on the position of the magnetic material, and can be modeled as, L(y) = L1 + L0 / (1 + (y / a)) where y is...

It's electromagnetics time again. I'm horribly stuck on a homework problem. It has to do with mutual inductance, and I know how the problem works conceptually, but I'm having a difficult time with the mathematics. The problem:A very long (read: infinite) wire is a distance d from the center of a...

Does the formula tan (phi) = (wL - 1/wC)/R work without a capacitor? Can I turn it into tan (phi) = wL/R instead? I don't know what formula to use to find the inductance of an inductor in this question: A voltage source V = 160V sin (100t) is connected in series with an inductor and a 17.0...

Hi, My Question: What is the inductance of a coil if the coil produces an emf of 2.50V when the current in it changes form -28.0 mA to 31.0 mA in 12.0 ms? For this I know I will need to use this equation: E=-M(delta I)/(delta t) My problem is that I was wondering if coming up...

physics problems concerninginductance and rlc circuit -------------------------------------------------------------------------------- 1. "The resistance of a superconductor." In an experiment carried out by S. C. Collins between 1955 and 1958, a current was maintained in a...

hello frnds, I am in jeopardu regarding d thing ,so u gyz uot there pleeze tell me can we have a inductance of a transmission line placed in vaccum? hope u gyz will pull me outta this soup.

Does a beam of electron exhibit inductance equivalent to the one in wires?

Inductance Help! https://www.physicsforums.com/attachment.php?attachmentid=3779&stc=1 Hello, I was wondering if I could get some help on the following questions, First of all let's me explain...I am a high school student who is trying to learn the basics of electrical...

The inductance of the solenoid determines the time it takes to establish this current. Find the inductance,the resistance, and the time constant of a solenoid that is constructed by wrapping five “tightly wound” (i.e., wire-against-wire like this ) layers of 0.30 mm diameter copper wire on a...

I have 2 inductors in series...iron core...iron yoke...with a capacitor in parallel. For best mutual inductance, does it matter which direction each coil is wrapped...or maybe a better question would be how do you insure that the poles will be opposite every cycle so they are not working...

I'm getting confused over the formal definition of mutual inductance. I've googled and searched a lot of sites, but I still don't understand, so I'm hoping someone here can explain it to me in plain English! In our lecture, this was the formula given for mutual inductance: L_{12} =...

Hi all, I've managed to solve the following question but the answer I'm getting doesn't seem right... What inductance must be connected to a 17 pF capacitor in an oscillator capable of generating 550 nm (i.e. visible) electromagnetic waves? Comment on your answer. To solve it I just...

The variable capacitor in the tuner of an AM radio has capacitance of 1800pF when the radio is tuned to a station at 550 kHz. a) What must be the capacitance for a station at 1600 kHz? I found the frequency first and then am I supposed to setup the 1600 equal to the frequency to find the...

I have my question,solution and the problem I faced in the attachment that followed.Thanks for anybody that spend some time on this question.

Two coils are wrapped around the same cylinder form. When the current in the first coil is decreasing at a rate of -.242A/s, the induced emf in the second coil has a magnitude of .00165 Volts. What is the mutual inductance? What I did: E_2 = -M(\frac{d_i_1}{d_t}) .00165/-.242 = -M...