Solenoid Definition and 752 Threads

Homework Statement A long solenoid has current I flowing through it, also denote N as the turns per unit length. Take its axis to be the z-axis, by symmetry the only component of the magnetic field inside is Bz. Find the magnetic field at the center of the solenoid (on the axis). Also, find the...

Hi, I'm trying to calculate the length of wire that I need to wound a coil using a spool and wire of known dimensions. I was trying to use this converter but I'm not getting good results: http://www.had2know.com/technology/solenoid-coil-wire-calculator.html For instance: with a wire radius of...

Homework Statement Iron core solenoid, with 50 turns per cm (5000 per metre) Current = 0.2A Measured B field = 1.58T Calculate: i) The applied field, Bapplied ii) The magnitude of magnetisation, M, of iron alloy Homework Equations For a long solenoid, Bapplied=μ0nI And, generally...

If you have a one solenoid inside another (with the same number of coils of wire) the current is going through the inner one. How does the induced EMF in the outer one depend on the frequency of AC in the inner one

I found this formula to approximate the inductance of a coil of wire. But what if a solenoid were composed of N separate loops, where each loop of the solenoid is connected to its own battery? That is, what if the solenoid had the same number of loops and the same geometry, except that each loop...

I have a solenoid, Length L, number of turns N, ampers I Radius R I have a Point P(x,y,z) anywhere around said solenoid. How can I calculate the field strength at point P, note it is OUTSIDE the solenoid, and could be anywhere outside. Assume the origin is the center of the solenoid, let's...

Homework Statement A single-turn square loop of side L is centered on the axis of a long solenoid. In addition, the plane of the square loop is perpendicular to the axis of the solenoid. The solenoid has 1280 turns per meter and a diameter of 5.85 cm , and carries a current of 2.15 A . Find...

Homework Statement A pair of wires carry a current I=2.4 A to and from a solenoid. The solenoid contains 600 coils of wire wrapped in a cylinder 15 cm long and 1 cm in diameter. a.) What is the magnitude and direction of the magnetic field at point A d1= 5 mm from the near wire and d2= 7 mm...

Does anybody know where a powerful solenoid can be bought? Need to create a strong magnetic field for an experiment.

Hi Everyone, This is Sentil from India. I'm a professional in the field of commerce. But i love science! then the obvious question "Why /How did you end up in Commerce". Thats really a long story. But today I am here to get help on one of the side projects i am into to develop something like...

I enjoy doing kitchen engineering with my kids. We were looking to do a robotics experiment which would require a linear solenoid actuator to continuously pump. I thought it would be simple until I realized that I would likely need a 555 chip(?) and some skills with circuitry...which would be...

Hi, I am working on a project with my daughter who is 10. We are trying to get a linear solenoid actuator (push) to continuously repeat (push/return...push/return). But all it does is push and stop. How do I get the wiring set up to enable the solenoid to automatically cycle? Thanks!

Homework Statement / Homework Equations[/B] I was looking at Example 5.12 in Griffiths (http://screencast.com/t/gGrZEPBpk0) and I can't manage to work out how to verify that the curl of the vector potential, A, is equal to the magnetic field, B. I believe my problem lies in confusion about how...

Can anyone way in on the correct Formulas of a Solenoid Magnetic B-field at Ending, Middle and Outside? I have the following so far but some of them seem to contradict one another . Photo #1: Photo #2: Photo #3: Photo #4: Photo #5: Photo #6:

Hi, I'm trying to figure out how the current density for a poloidal current in toroidal solenoid is written. I found you may define a torus by an upper conical ring ##(a<r<b,\theta=\theta_1,\phi)##, a lower conical ring ##(a<r<b,\theta=\theta_2,\phi)##, an inner spherical ring...

I am toying with an idea and not sure if it's feasible. Here is the setup: There is a 6' diameter steel pipe that is 30' long standing up vertically. Inside, among other stuff, are ~20 small 'trolleys' on tracks that run from top to bottom, spread out evenly among the cross sectional area of...

Anyone knows the Magnetic B Field Equation Due To Multi-Layer Solenoid(with a core) ? where: Core Material "μ" is of radius R1(NOT shown in the below drawing) i - Current μ - Permeability (of Core Material)All length, diameter and pitch measurements are from centre to centre of the conductors...

Although I'm sure the answer is obvious, but why are solenoids used as inductors? Why don't entire circuits in general have inductor properties, since the entire circuit creates magnetic fields? More specifically, why don't random points along a circuit do the same thing as a solenoid (retain a...

Homework Statement A coil of 25 turns of wire is suspended by a thread. When a current flows through the coil, the tension in the thread is reduced by 4.0 ´10-2N. http://members.shaw.ca/barry-barclay/Self-Tests/test11/Magnet20.gif Homework Equations F=IBL B=nμI[/B]The Attempt at a Solution...

Hey All, I'm trying to design a solenoid that would generate about minimum 1.6 A of current in order for me to charge up a 1.5 A 1.5 V battery. I already designed one which is about 10CM in length and unknown number of turns (as I used a drill to wind the coils around it. so I would guess its...

If a solenoid were wrapped around a bar magnet, and a charge were applied through the solenoid, would there be resistance?

Homework Statement Just a quick clarification about the law: B = 4pi * 10^-7 * n *I/LDoes n refer to total number of loops, or just the number of loops in a single layer? Like, If I have a solenoid that's made up of 4 layers and 1000 total loops, do I plug in 1000 or 250?Homework EquationsThe...

We see the magnetic field calculation by Biot-Savart law for a circular current I on some distance z on the vertical axis throw it centre as: $$ B(z) = \frac{\mu_0I}{2}\frac{r^2}{(r^2+z^2)^{3/2}} $$ where r is the radius of circle. When we use summation of N rings lays on L length, like...

If a solenoid oriented on the z axis is carrying a steady current, I if will produce a constant B field inside of the solenoid. A charged particle with initial velocity perpendicular to the z axis will undergo cyclotron motion within the solenoid at a constant radius, r. What are the electric...

Hi! I have some simple questions on the formula for torque on a coil in a magnetic field, ie this one: τ = NIA sinθ where I is the current flowing through the coil, A is the area of one loop, N is the number of loops, B is the magnitude of the magnetic field and θ is the angle between the...

Homework Statement I came across a recent problem that asked me to calculate the flux density at the end of a solenoid. I was given the current 3 A , the number of turns per unit length , 12 cm-1 and the using the permeability of free space as 4π × 10^-7 Homework Equations The equation I used...

For a solenoid as on the picture with a diamagnetic in the middle, the total B-field generated will come from both the free currents inside the solenoid as well as the induced magnetic field from the diagmagnetic material. But will the magnetic field attributed to the bound currents inside the...

Now well the question is pretty straight forward , and please do not pass this by , I am in high school but I am a still a very accomplished physics student. I am currently doing Magnetism and I came by a question , where people are saying a solution that seems very counter-intuitive to me...

Could someone check my calculations? Homework Statement Calculate intensity of magnetic field inside of solenoid, who is made from 1mm thick copper wire with 28 twines(n=28). Solenoid is 25 cm long, diameter - 4 cm, and it`s connected to 24V DC voltage. U=24V ; n=28 ; ρ for copper =0,0175...

Homework Statement I'm having problems figuring out the difference between a coil and a solenoid. My book provides two equations for magnetic field, and they are similar, but one depends on the radius (coil) while the other depends on the length (solenoid). Homework Equations Bcoil = μNI/2a...

Hey Guys! Hi Guys! Well I am new here and I have to confess that I somehow got stuck in a 3D transient electromagnetic simulation of a solenoid actuator and… I’m a mechanical engineer^^ So I would appreciate some help of you guys! 1. I imported the geometry from CAD-files. But I remodeled...

Homework Statement A solenoid has 500 turns per meter and cross-sectional area 4cm2 Current through it is increasing at 100A/s and flows in a clockwise direction. There is a wire loop, concentric with the solenoid which sits outside the solenoid. Given that the magnetic field inside the...

Homework Statement A bar magnet is held stationary (with respect to the loop of wire) at the centre of the loop with the North pole sticking out one end and the South pole sticking out the other. What happens to the size of any EMF induced in the loop once the magnet has been replaced by a...

Suppose I have a plastic tube about 70% full with magnetic powder, with a copper coil solenoid around the cylinder. By "magnetic powder" I mean each particle is actually a tiny permanent magnet with its own magnetic field. - like you can see in this video When there is no externally applied...

Homework Statement A long solenoid has 35 turns/cm. With a current of 4.0A, what is the field strength at the core? Homework Equations \beta = \frac{\mu N I}{2r} The Attempt at a Solution I have no idea with the radius is; that's the entire problem statement above.

Hey, I've seen a few posts on this without any responses I really thought helped (at least help answer my question). So, I was hoping somebody on the forums here could help walk me through the basic physics of a coilgun. Basically, how could you characterize the magnetic field inside the...

Homework Statement In science class, we are supposed to explain how a generator works and functions. However, we have to incorporate coulomb's law in our explanation. Homework Equations F=kQ1Q2/r^2<-- coulomb's law The Attempt at a Solution How I understood it was that a generator consists of...

Hi all, I'm trying to generate enough current using a solenoid to intermittently power an LED. My plan is to buy some enameled copper wire and wind it around pipe. This will be my solenoid. Then, magnets will be pulled through the pipe on string or what-not and, by Faraday's Law of Induction...

i want to build an electromagnet which can attract small iron pieces(2-3 mm long) at a distance of 10 cm from the magnet.I am using 24 awg. magnet wire.Please help .answer these questions - 1) How long magnet wire (24 awg) do i need? 2)How much current 3) what shud be least radius of solenoid 4)...

Homework Statement An electron enters a solenoid at 65 degrees below a solenoid. The solenoid has a 10 A clockwise current is 33.0 m long and has 400 turns. Ignoring end effects what is the shortest amount of time in which the electron pass through the solenoid? Homework Equations Only one I...

I'm not so smart when it comes to electrical things, so please forgive my ignorance. Here's what I am trying to do. I have a quad axle dump truck, I'm trying to have the drop axles automatically come up when put into reverse. The drops are raised and lowered via 2, 12 volt solenoid valves. I...

Any recommendations for getting an accurate reading of a magnetic field in a solenoid coil? They're ferrite cores wrapped with magnetic copper wire. Would putting a Hall sensor at the end of the ferrite be a reasonable way to do this? Or will the field have already diverged? (The coil stops...

Hello! We are working with some ferrite rods to build solenoid magnetorquers for a cubesat design. The geometry on these rods is unique. Are there benefits to this type of a geometry? They are 19.6 cm length x .67cm diameter.

I am trying to calculate the magnetic field (in tesla/gauss) of an iron core electromagnet that is very small and has very few windings. For example 12 windings over 0.003 meters. I know this is not going to produce a very strong field, but I would like to pulse a strong current through the coil...

So, I recorded the result of a LabQuest 2 Vernier Magnetic Field Sensor on different points of a plane, with a solenoid in middle with a 5 amp current running through. I want to compare my results with theory, but have no idea what equation I'm supposed to be using. I assumed it was B = μ0ηI/r3...

Not for a class or anything, just out of curiosity, how would you calculate the current in a solenoid, not given a magnetic field, but just using a bar magnet? I know it will just be some form of Faraday's law. E=N(dphi/dt). Maybe not. I'm imagining all I'm really missing is how to calculate the...

The field lines inside of a solenoid all go in one direction, right? So why doesn't a magnet that's placed in the solenoid simply get forced one way or another. I tried this at home by placing a magnet in the solenoid(near the outside of the coil so that it stuck out a bit), and when I turned on...

Hello everyone, this is probably a simpler problem than I think but here it is My argument is that the length of the solenoid is the number of turns times the diameter of the wire so B=\mu_{0}\times n\times I\\\\ =\mu_{0}\times \frac{N}{L}\times I\\\\ =\mu_{0}\times \frac{N}{N\times d}\times...

When they teach transformers, they give you the Ampere's law, the Faraday's law, etc. and then derive this well known formula L = μ * N^2 * A / ℓ. And everything is no nice, all these parameters are used to define some other relationships, like the concept of reluctance in magnetic circuits...

Homework Statement Experiments carried out on the television show Mythbusters determined that a magnetic field of 1000 gauss is needed to corrupt the information on a credit card's magnetic strip. (They also busted the myth that a credit card can be demagnetized by an electric eel or an eelskin...