Inductance Definition and 495 Threads

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 During a 65 ms interval, a change in the current in a primary coil occurs. This change leads to the appearance of a 6.0 mA current in a nearby secondary coil. The secondary coil is part of a circuit in which the resistance is 12 . The mutual inductance between the two coils is...

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...

A circular loop of wire can be used as a radio antenna. If an antenna with a diameter of .215 m is located a distance of 2.50 km away from a from a source with a total power of 57.0 kW at a frequency of 102 MHZ, what is the maximum emf induced in the loop? (Assume that the plane of the antenna...

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...

Inductance Measurement of a Pulsed Plasma Thruster I´m trying to measure the total inductance of a pulsed plasma thruster. According to usual formulas found on books I calculated it should be about 200 nH (very small). The strange thing is that I measured a smaller value than this (about 130...

hey, i was just confused here, which is the right formula for finding the self inductance of a solenoid, given the number of turns, the cross-sectional area, the length, and the current. is it L = Uo x Ur x N^2 x A / L (Uo = mu o, Ur = mu r)?? pls if it is wrong, let me know the right...

Im reading chapter one for physics 2. It says that you can create a charge on a neutral body through inductance. It says that the charged object will make the electrons near it be repeled on the neutral object. So there will be a positive charge near the source object of negative charge. My...

In the figure attached below, the rolling axle, 1.50 m long, is pushed along horizontal rails at a constant speed u = 3.00 m/s. A resistor R= 0.400 Ω is connected to the rails at points a and b, directly opposite each other. (The wheels make good electrical contact with the rails, and so the...

A solenoid has 140 turns uniformly wrapped around a soft iron core, which has a magnetic permeability =750 Uo (mue sub-knot) diameter of 10.0m and a length of 9.00cm. What is the inductance in milli-henry (mH)? Did I set this up right? Using L=(uN^2A)/length, you get...

Hi everyone, I'am trying to find the formulas of the mutual inductance of an one single layer coil (the cross section is rectangular i.e. the wire is rectangular or a round loop with rectangular cross section)on cylindrical winding form. Does anyone know how to calculate this mutual...

Hello, I'm a new member of the forum. Are there any good sources of information available that contain (and explain) inductance calculations for various symmetrical (but unconventional) geometries? I'm interested in a triaxial conductor that is similar to a coax in geometric make-up, but...

I'm having problems trying solve this problem. Consider the two conductor system given below |----------------------------------------------------------------| | <------a-----> | | I2-> ______________...

Hi, All: I am trying to calculate the mutual inductance between the coil (100 turns) and the magnet. Does anybody know any approaches that may lead a satisfactory answer. So far, I have been using Neumann's formula which is the formula for mutual inductance, M, between two loops. I...

Hi, All: I am trying to calculate the mutual inductance between the coil (100 turns) and the magnet. Does anybody know any approaches that may lead a satisfactory answer. So far, I have been using Neumann's formula which is the formula for mutual inductance, M, between two loops. I...

I'm stumped by the following problem. To determine the inductance of a coil used in a research project, a student first connects the coil to a 12.0V battery and measures a current of 0.630 A. The student the connects the coil to a 24.0-V(rms), 60.0-Hz generator and measures an rms current of...