Solenoid Definition and 705 Threads

Hi, I red that in Franklin's book "Classical Electromagnetism" there's off-axis magnetic field of a solenoid solution...well I need that but can't get the book... so I'm wondering if anyone has that solution for magnetic field of a solenoid analytically? It's important and I would be...

Hello , I have been wanting to find out the how heat generation of a tubular solenoid (pull-type)actuator is calculated? Secondly, why do most solenoid design use a plunger with a flat face/conical surface area . If I am looking for 1mm of stroke.. and a force output of 2500N, what apex...

I've just recently seen the term "inductor" for the first time and it kind of threw me off. I'm just wondering, what's the difference between an inductor and a solenoid, if there is one?

given a long solenoid, with a radius of R (R<<L), a current of I flows throught it. find the magnetic field at point A which is located at a distance of R from the solenoid on the solenoids line of symetry. HOW DO I DO THIS?? the only thing i see that i think i need to do here is somehow...

1. The problem statement, all given/known data A bar magnet is positioned at the mouth of a solenoid. The current indicated in the solenoid is then turned on. (Assume the solenoid is a lot bigger than the bar magnet.) Gravity and friction can be ignored. Describe what would happen, and...

Hey guys I have been wondering do the cross-sectional area of the copper wire affect the solenoid?So far I only know that the cross-sectional of the core material , turn of wire (N) , leakage , etc. affected it.Have been wondering for so long since the formula given in many website doesn't state...

Some students were performing an experiment involving 2 solenoids in a line, a power source attached to the primary, and a globe attached to the secondary solenoid. A crude depiction of the setup is as below. /////// /////// <---- Rod inserted here Pri . . . Sec An iron rod was...

Hi, this isn't an actual question, but is a confusion inspired by a question I did (hence me not using the template). I'm having trouble with this example. I'm talking about a solenoid (with core, but doesn't really matter), with n turns per unit length, and a current I_0 t going in. \vec{z} is...

Homework Statement "A light bulb is connected to a coil of wire. If a magnet is passed back and forth through the coil the bulb will light up. Why?"Homework Equations The Lenz Law isn't really an equation, but it states that: "The magnetic field of the induced current is in a direction to...

Hi, I am trying to design a simple water valve that opens a plug in a small water reservoir until its empty. So far I have a solenoid coil wound around a hollow core plastic pipe with a cylindrical rare Earth magnet inserted halfway into the pipe with a 'plug' attached to the top of the other...

A small loop of area A is placed inside a long solenoid that has n turns per meter and carries a sinusoidally varying current of amplitude i. The central axes of the loop and solenoid coincide. If i = i0sin ωt, find the emf in the loop. EMFinduced = - d(\phiB)/ dt \phiB=BA Bsolenoid=...

imagine a very long solenoid with radius R ,n turn per unit length , carry current I.coaxial with the solenoid are two long cylinder shell of length L-one ,inside the solenoid at radius a ,carries a charge +Q,uniform distributed over its surface;the other ,outside the solenoid at radius...

Hey, I have a school project and I need a solenoid to induce a magnetic field. http://www.yourpicbox.com/images/orhBIhKZq6426.jpg I made a solenoid by winding a wire (I'm not sure what to call this wire. It's thin and brown.) to a pen case. I made 3 layers, 100-200 turns each. When I tested it...

Hey guys, As a hobby I've decided to pick up EE and I've been reading quite a bit and I'm interested in building some basic circuits and determining the SRF in some coils that I've wound. I have found that you can calculate SRF using this formula: ......(1/5) ...29.85 x (H/D) F =...

Homework Statement The magnetic field inside an air-filled solenoid 39.9cm long and 2.00cm in diameter is 0.800T. Approximately how much energy is stored in this field? Homework Equations U=(1/2)LI^2 => U = (1/2)(B^2)(area*length)/(u) The Attempt at a Solution I discovered how to...

Can someone help me understand what this solenoid is doing? It's somehow integrated into a switched shutoff system. I'm trying to figure out if I can jump two wires or ultimately add an on-off switch in line somewhere between the switch and this solenoid. Thanks for any help. click to...

Homework Statement During a lab we used a 570turn solenoid powered by a current of 5amp. For the last part of the experiment we were to take several measurements of the field strength across the cross-section of the solenoid. So we moved the field sensor around inside the solenoid and made...

Homework Statement The magnetic field inside a cylindrical solenoid of area 4 cm^2 is 0.15 T along the axis of the solenoid. What is the magnetic flux through a disk of radius 3 cm placed perpendicular to the solenoid axis? Homework Equations \phi = \zeta B * dA The Attempt at a...

GHz ac frequency- Maximum "Practical" generation - Solenoid question for the experts. It's me again. Big ideas, big questions. (A quick special thanks to everyone who has ever taken a moment to answer my questions: (Bob S, bipolar, Phrak, f95toli, jambaugh, waht, Pumblechook, ZapperZ...

Homework Statement For my physics investigation I am required to first find the theoretical magnetic flux denisty at different points about a solenoid. The points are outside the solenoid: along the axis but past the ends and; perpendicular to the centre of the solenoid but outside. So far...

Homework Statement A tightly wound solenoid of length L and radius a that has n turns of wire per unit length carries a current I. Calculate the the magnitude of the magnetic field at a point P on the axis of the solenoid, outside it and a distance y from one end, as shown in the figure...

This is not a homework question, it's just to help my conceptual understanding of two quick things: Suppose you have an ideal solenoid placed horizontally in front of you. The current is traveling (spiralling) from your left to your right. What direction is the magnetic field inside the...

Homework Statement A 800-turn solenoid, 18 cm long, has a diameter of 2.9 cm. A 15-turn coil is wound tightly around the center of the solenoid. If the current in the solenoid increases uniformly from 0 to 3.1 A in 0.28 s, what will be the induced emf in the short coil during this time...

Homework Statement http://www.aijaa.com/img/b/00106/3735947.jpg Homework Equations \epsilon =- \frac {d \Phi}{dt}=- \frac {d BA}{dt}= \oint \vec{E} \cdot d \vec{l} B= \mu _0nIA , where n is solenoid's turns per meter. The Attempt at a Solution I was able to solve this through trial and...

I am trying to produce a magnetic field with a flux density of 1 Tesla through a solenoid with an iron core and I am having trouble crunching the numbers. I may also be doing the wrong computations. I am not too sure of the permeability of the iron core, I've seen different values, one being the...

Homework Statement A long straight wire lies below to a circuluar loop of wire. The straight wire is carrying a constant 10A current to the right. What is the magnitude and direction of the current in the circular loop, if its diameter is 1 m and its center is 0.75m away from the wire...

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...

The question is basically asking you to find an expression for the magnetic field of an infinite soleniod, through the center of the solenoid(lengthways), and around the coils of the soleniod. I know, with help from te textbook, that the magnetic field of a loop is 2(pi)b^2I/cr^3. Where b is...

I need to use Ampere's Law and Gauss' Law to show that inside a solenoid B_r=0,B_\theta=0,B_z=0 i tried using cylindrical polars on ampere's law but the expression just got really long and i couldn't see any way out of it.

Homework Statement You want to construct a solenoid 20cm long that has an interior magnetic field Strength B (Bc) of about 1.5MN/C. The coil has to be wound as a single layer of wire around a form whose diameter is 3.0 cm. You have two spools of wire handy. #18 wire has a diameter of about...

Force Inside a Solenoind ? Hello I'm working on a personal project which involves a solenoid. I'm trying derive an equation for the Force(N) that an object would experience due to the flux density inside the coil. The flux density can be calculated relatively easily by the fallowing...

Homework Statement A 200-turn solenoid having a length of 25cm and a diameter of 10cm carries a current of 0.29A. Calculate the magnitude of the magnetic field B inside the solenoid. Homework Equations B = \mu0ni The Attempt at a Solution Well, I plugged the numbers into the...

Homework Statement the question can be found here: http://www.mailfreeonline.com/uploader/CED0D65C.jpg Homework Equations ampere's law The Attempt at a Solution a. (is B the magnetic field?) B = uI/L; u = 4pi x 10^-7, I = 1, L = 2pi x 0.1 so B = 2 x 10^-6 ^ can anyone...

I have been doing some experimenting with a relatively short cylindrical permanent magnet and a solenoid with DC current applied. I would like an explanation as to why these two things happen. The OD of the cylindrical magnet is just a little bit smaller then the ID of the solenoid. Placing...

hi, My homework is : Qualitative description of field due to long solenoid. I think I post in wrong box, that box is about the calculus problem, right? But I'm a new member and I don't know where to post my question. So if I'm wrong, I'm sorry, please answer me once and tell me the right box...

I made two solenoids using the same amount of wire (1000ft of 24 AWG) around 2 identical bobbins. One of them I painstakingly wound the wire uniformly and tightly. This solenoid is strong enough to pull a steel rod into the middle of the core. The other I haphazardly wound as fast and...

I have to design a solenoid. It should be wound on some soft metal of certain permeability. It should have hollow inner dia that will be used to operate a gas valve. The problem is which equations should I use to design the solenoid. I also have to calculate the force that will be required for...

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

Homework Statement A solenoid of cross-sectional area 2*10^-4 m^2 and length 0.5m having 500 turns is to be used to produce a uniform magnetic field some distance close to the center of the solenoid. Find the current that must flow in the solenoid to produce a magnetic flux density of 3*10^-3...

Homework Statement A compass, consisting of a small bar magnet resting on a frictionless pivot through its centre, is placed in the middle of a long solenoid, which in turn is aligned with its axis pointing North-South. With a current of 1 Amp passing through the solenoid, a small...

I want to develop a solenoid for push application. the required push is around 5kg by electromagnet. We can use a combination of permenant magnet and electromagnet to optimize the design with respect to area and power consumption. For eg. the solenoid can push a permenant magnet also...

Hi.. I have a question about AC magnetic field, wondering if you can help me understand this. For a DC solenoid coil, We can say Magnetic field H=N*i/L (simplest form) For an AC input, H=N*isin(wt)/L ; H(rms) = N*i/L (i is RMS value) As long as the current i-rms is kept constant...

I want to calculate the electrical parameters of solenoid coil of a valve for a given spring force. I know the force required to pull the solenoid plunger through a given distance against a spring, is there any formula to find out the required voltage, number of turns of coil winding & current .

1. Homework Statement A long solenoid with 70.0 turns of wire per centimeter carries a current of 0.100 A. The wire that makes up the solenoid is wrapped around a solid core of silicon steel (Km=5200). (The wire of the solenoid is jacketed with an insulator so that none of the current flows...

Homework Statement A long solenoid with 70.0 turns of wire per centimeter carries a current of 0.100 A. The wire that makes up the solenoid is wrapped around a solid core of silicon steel (Km=5200). (The wire of the solenoid is jacketed with an insulator so that none of the current flows...

Homework Statement Find the magnetic flux through a solenoid of length 31.2 cm, radius 1.5 cm, and 610 turns that carries a current of 3.8 A. (in Wb) Homework Equations B_solenoid=u0*N*I/L Flux= B *A The Attempt at a Solution So to find the magnetic field, I plugged the...

Homework Statement The magnetic field produced by the solenoid in a magnetic resonance imaging (MRI) system designed for measurements on whole human bodies has a field strength of 4.0 T, and the current in the solenoid is 300 A. What is the number of turns per meter of length of the...

Homework Statement A coil with 170 turns, a radius of 5.0 cm, and a resistance of 12 ohms surrounds a solenoid with 230 turns/cm and a radius of 4.7 cm; see the figure. The current in the solenoid changes at a constant rate from 0 to 1.8 A in 0.11 s. Calculate the magnitude and direction of...

Homework Statement A square, single-turn wire loop 1.00 cm on a side is placed inside a solenoid that has a circular cross section of radius 3.00 cm, as shown in the figure below. The solenoid is 16.0 cm long and wound with 95 turns of wire. (a) If the current in the solenoid is 3.00 A...

Homework Statement A solenoid has 235 turns of wire wrapped along its length of 27 cm. The diameter of the solenoid is 1.5 cm. In the middle of the solenoid is a smaller coil of diameter 1.0 cm with 50 turns of wire along its 2.0 cm length. The two coils are coaxial. A current of 15 A is in...