Coil Definition and 864 Threads

Hi, (I posted this on TSR as well, but they're being a bit slow...) Take the following setup: If you move the bar magnet left and right (a few cm) inside the coils, so that the ends do not leave the coil, will it induce a current/emf? I presume it does so, as I have been taught. But I don't...

What is this(copper-coil one)?

A 138 turn circular coil has a diameter of 2.00 cm and resistance of 53.0 Ω. The plane of the coil is perpendicular to a uniform magnetic field of magnitude 1.00 T. The direction of the field is suddenly reversed. a.) Find the total charge that passes through the coil. b.) If the reversal...

I'm designing a circuit to discharge a capacitor though a coil of wire to make a large magnetic field, which is basically an undriven RLC circuit which starts out with a charged capacitor in series with an inductor and a resistor (the coil having a certain resistance in addition to its...

Hi, i m new here n very poor in EE.. just want to ask that, is there any formula for us to calculate voltage induced on a coil if we have the info like the number of turns of the coil n the flux (mWb/sec).. cos i can't get from google as well...sorry for trouble n thanks for ur guiding...

1. Homework Statement See attachment. 2. Haven't gotten there yet. 3. The problem I'm having with this is seeing the connection between the capacitor (at least, that's what I assume that square thing is) and the loop. Frankly, I don't see why there would be or why there must be...

[b]1. Derive an equation to find the induced EMF on an inner solenoid by a changing current on an outer solenoid. Homework Equations We're given the equation EoRMS=(No*Ai*(2*pi*f)*(permeability constant)*IiRMS)/Li for the induced EMF on the outer solenoid by a changing current in the...

Homework Statement A rectangular coil of 200 turns has a length of 200 mm and width 120 mm. The coil rotates with a constant angular speed of 1200 revolutions per minute about an axis through the midpoints of its longer sides in a uniform magnetic field of 2.4 x 10-2 T. Starting from a...

Homework Statement This is the solution to one of the problems I came across: In an AC generator, a coil spins in a magnetic field. Of the following choices, circle the one that will not cause an increase in the EMF generated in the coil? a. replacing the coil wire with one of lower...

Hi, I've an experiment in which I've some magnetic material place into a coil that's used as sensor. Say it's a cylindrical one for the sake of simplicity. I'm trying to evaluate the flux induced by the material into the coil so that I can optimize the coil parameters (size, position and...

Question: A coil of 90 turns, of resistance 6 ohm and area 28 cm² moves from a uniform magnetic field of 0.02 Tesla to one of 0.42 Tesla in 3.0 second. What average current flows in the wire (in amp) ? Relevant equations: EMF= (Area * Rate of change of magnetic flux) * Number of turns...

Hi, I'm working with my granddad on a project to build a (simple!) electricity generating windmill. We're not trying to make the most efficient design possible, just a reasonably efficient design given the simple tools and materials we're using. It's mostly just a project for fun! :) So, we...

I've found this video on the web: http://www.youtube.com/watch?v=TIhPayFBE9c&feature=related and id like to be able to build one myself. But i don't really know how to start with this nor how it works. -The 8 shaped coil is really 8 shaped or just 2 coils bound together? -how do you make...

Whats the easiest way to test the max output of electricity induced in an air coil. I will wire it 3 phase delta. (or double delta) Will I need a resistive load attached for current flow? What should I use? How do I test? Use a multi tester? Is there math I can use to estimate the amount. I...

A circular coil of 50 turns has a radius of 0.2m and carries a current of 5A. The coil is in a field where the magnetic induction is 0.6 Web/m^2. What is the max torque on the coil? I used the formula for the torque on a coil: r=NBIAcos(theta) I assume that the angle for max torque is 0 my...

Ok, now I got another question while doing electromagnetic induction questions. I know flux linkage=NBA and in a rotating coil, Flux linkage=NBA cos wt, which differentiated (Faraday's Law) wrt time gives E=NBAw sin wt, where w = angular frequency. However, when the plane of the coil is...

Hi everyone. I have a confusion over a certain concept. I know the torque for a rotating coil in a uniform magnetic field is BIAN. But what if the coil is at a certain degree to the magnetic field? http://img44.imageshack.us/img44/1926/magnetic.th.png Sorry for the bad drawing. My...

Homework Statement a tightly wound circular coil has 36.8 turns, each of radius .1m. the uniform magnetic field is in a direction perpendicular to the plane of the coil. the field increased linearly from 0 to .42t in a time of .251s. what is the emf induced in the windings of the coil...

Homework Statement a circular coil of wire has a diameter of 2 m and contains 10 loops. The current in each loop is 3 amps, and the coil is placed in a 2 tesla magnetic field. Determine the maximum torque exerted on the coil by the magnetic field. Homework Equations F = IL x B...

Homework Statement A circular coil of 394 turns and area 0.78 m2 is in a uniform magnetic field of 0.8 T. The maximum torque exerted on the coil by the field is 0.0059 N · m. Calculate the current in the coil. Answer in units of A Homework Equations torque= i*A*B The Attempt...

What is the drag force on a magnet falling through a coil? I have found several sources online describing the drag force on a magnet falling through a conductive pipe. How might this vary if a coil is used in place of a pipe? Does the coil need to be connected to a circuit to create this force?

I am looking for the B-field of a real coil. So a straight piece of pipe with some current density. Is it correct that there is no analytical solution to this? It would be enough if I had the field of a current rotating in a cylinder obviously. I am working on some Biot-Savart but either I...

I'm trying to build a Tesla coil, for the first time, and have some questions. Whatever sources i came across on the internet only tells how to build one out of household items, trash, radio shack components, etc, but not why and which way the thing works. The thing...

Homework Statement A square, single-turn wire coil L = 1.75 cm on a side is placed inside a solenoid that has a circular cross section of radius r = 2.82 cm. http://capa8.phy.ohiou.edu/res/ohiou/serwaylib/Graphics/Graph20/serw2014.gif The solenoid is 22.0 cm long and wound with 113 turns...

MMC capacitors exploding on my tesla coil, I need help! Im in a tight spot. I just recently built a decent sized tesla coil. Everything works flawlessly except that my capacitors are melting. They don't fail but they emit flames or they arc, (its hard to tell). Then after inspecting the...

Homework Statement Im currently in my last year of high school, and I'm writing a report on AC generators. I've heard a number of different things from different sources. When the coil is perpendicular to the magnetic field, maximum magnetic flux is flowing through the coil. This is then at a...

what does a self-resonant system mean?(e. g: a self-resonant coil )

Homework Statement A conducting coil of 1830 turns is connected to a galvanometer, and the total resistance of the circuit is 41.0 . The area of each turn is 4.70 10-4 m2. This coil is moved from a region where the magnetic field is zero into a region where it is nonzero, the normal to the...

I don't understand when you have an AC Circuit that has a coil, capacitor and resistance. What factor will the resonant frequency change when the frequency is tripled?

I had a small, about 1 foot secondary tall tesla coil with about 3 inch leaders coming off the toroid, and when i turned it on, I had an LED bike blinker light that would turn on when I would turn on the tesla coil. The blinker was about a foot away from the coil. I was wondering if anyone...

so, I'm pretty bored and decided that i want to make a speaker. I've bought some thick copper wire, and twisted it in the form of a coil, then twisted some more with a larger radius so i can put the first one inside the second one and so on.. my motivation to buy the thick wire was to maximize...

Homework Statement There is one square coil of area A that rotates with speed \omega around axis y. The magnetic field is uniform and points to the z direction. Show that the torque is \frac{A^2B^2N^2\omega sin\omega t}{R}. Homework Equations T = |\underline{m} \times \underline{B}|...

We have an infinite coil of N turns per unit length with radius a, carrying a current I and we want to find the magnetic field using Ampere's Law. If we put the loop outside the coil it can be established that B=0 If we use the loop to enclose the coil and we apply Ampere's Law we get that...

Homework Statement You have a coil of N turns, with current I through it. It is in a magnetic field B, which causes it to feel a torque. Give an expression for its magnetic dipole moment. Homework Equations The Attempt at a Solution Well, I know magnetic dipole moment is A...

I'm using PV cells to energize an air core coil. Is there a method in which I can determine the maximum length of 32 gauge magnetic wire to use, so that I don't use too few windings and burn the coil out or too many windings limiting its' potential. I'll be using 2 PV cells that are each rated...

Homework Statement http://img520.imageshack.us/img520/1843/picture7j.png Homework Equations for values 50 turn, 4.0 cm diameter, R = 0.50, surrounding 2.0 cm diameter, 20cm long, 200 turns, 60Hz through I_sol=(0.50A) sin(2πft) the solution would be...

Homework Statement You have a 1.10-m-long copper wire. You want to make an N-turn current loop that generates a 0.800 mT magnetic field at the center when the current is 1.50 A. You must use the entire wire. What will be the diameter of your coil? Homework Equations B =...

Hello all! I am a student of electrical & electronic engineering, in my final year; for my dissertation, I am exploring the possibility of scavenging energy from a magnetic field in order to power a wireless sensor..I am using a coil of rectangular cross section with a magnetic core occupying...

Hello everybody, First excuse me for my English. Could someone please explain how far the electromagnetic wave of a coil travels? Does it depend on the current flowing in the coil? The coil diameter? The coil's number of turns? What will happen to the waves if we increase the current of a...

Homework Statement Homework Equations e=d/dt(BAN) The Attempt at a Solution

What is the answer? Should be B Please Explain the reason behind I don't understand how an induced Magnetic Field will cause the coil to move. (Not Homework)[SIZE="2"]Source:tycphysics.org/TIPERs/TIPER%206_20_02_keys%20pdf/EMI%205a_Key_6_02.pdf thanks for helping

Homework Statement At t=0, a rectangular coil of resistance R = 2 ohms and dimensions w = 3 cm and L = 8 cm enters a region of constant magnetic field B = 1.6 T directed into the screen as shown. The length of the region containing the magnetic field is LB = 15 cm. The coil is observed to...

I'm currently making a coil assembly for a customer. The coil has the following specs: 120 VAC application 1,600 Turns 22 AWG magnet wire 12.5 ohms typically coil is in a circuit with a half sine wave rectifier and a solid state VAC controller current draw is .6 amps (72 watts)...

so i found a manual for a small HV device, using a flyback, powered by DC supply. here's the link for the http://tacashi.tripod.com/elctrncs/555sstc/555sstc.htm" i built a small platform giving the primary coil 8V in frequency which in theory should be around 20 KHz(i do not have an...

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 1.A circular coil, with radius of 10 cm, and 25 turns, rotates in a constant magnetic field of strength 2.4 T, with the axis of rotation perpendicular to the direction of the magnetic field. A. If the coil rotates at a frequency of 50 Hz, what is the induced peak voltage...

Homework Statement The component of the external magnetic field along the central axis of a 50 turn coil of radius 5.7 cm decreases from 1.8 T to 0 T in 3.3 s. (a) If the resistance of the coil is 2.8 ohm, what is the magnitude of the induced current in the coil? (b) What is the direction...

Hi everybody. I have a question on a magnetic field of a coil with N spire . I know the magnetic fields on point P that it has a about distance form coil center and staies on the central axis of the coil. Is possibile to determinate the magnetic filed of the coil on point P that does not stay...

I also have a membership at scienceforums.net and posted this to try to figure out what went wrong, but my post has been up for a week with 100 views and 2 replys both saying that they have no idea what I'm talking about. Hopefully I will have better luck here. Quick introduction: I am 16...

I was wondering if there is a simple way to make a power inverter (DC to AC) that is solid state, and does not use a coil. Actually, I'm not sure if there is a difference, but "pulsing DC" might be more what I'm thinking. I don't necessarily need the current to flow in reverse, but just to...