Solenoid Definition and 705 Threads

Homework Statement A solenoid has 1800 turns of wire and is 125 cm long and 10.0 cm in diameter; see Figure P.14 (attached). A circular wire loop of diameter 5.0 cm lies along the axis of the solenoid near the middle of its length as shown. (a) If the current in the solenoid initially is...

Homework Statement Consider a solenoid of length L, transverse area A, total number of loops N Compute the magnetic field B inside the solenoid, assuming that it is uniform and vanishes outside the solenoid, neglect any boundary effects. Working under the same assumptions, calculate...

Does anyone have an equation that describes the magnetic moment of a solenoid that does not actually use number of turns as an input? I'm trying to validate a solenoid I have made with something like 11000 turns, but I'm not sure how accurate my number of turns in, so I need a second input...

Hi, I was wondering about the path a charge placed in a solenoid that was flown through by alternating current would take. Would it move on a circularly? Thanks!

Homework Statement A solenoid inductor has an emf of 0.20 V when the current through it changes at the rate 10.0 A/s. A steady current of 0.10 A produces a flux of 5.0 microWb per turn. The number of loops in the solenoid is the value which needs to be found. Homework Equations...

Why is the steady state current through a solenoid greater than than the current when the plunger is first fully pulled in? I would expect it to be identical to the low peak in the current profile when the plunger hits the stop when fully engaged. Thank you, Jorge

Hey so I have been trying this problem and just cannot get it. thanks for the help. To construct a solenoid, you wrap insulated wire uniformly around a plastic tube 12cm in diameter and 55cm in length. You would like a 2.0A current to produce 2.5kG magnetic field inside your solenoid. What...

Homework Statement Consider an ideal cylindrical solenoid of length L and radius a=L/2 on which a thin wire has been wrapped a total of N turns. A steady current I flows through the wire. Assume the wires are wound so tightly that the solenoid can be thought of as a collection of N parallel...

Homework Statement A torodial solenoid has inner radius r1 = .15m, outer radius r2 = .18m; turns N=250 and carries a current I = 8.50A. What is the magnitude of the magnetic field at the following distances from the center of the torus? a) .12m b) .16m c) .20m Homework Equations...

Hello! I wonder if anyone can give me some quick advice. I'm designing a physically small (but high current) pulsed solenoid. The circuit will basically be an RLC circuit where a switch is thrown to discharge the capacitor into the coil, giving a strong short-lived magnetic field. I'm...

Homework Statement a single loop is placed deep within a 4 meter long solenoid having a total number of turns equal to 40000. the loop has an area od 0.01m^2 and it carries a current of 20 ampere. the loop is oriented so that the torque on the loop is a maximum with a magnitude of pi*10^-4...

Im just curious as to how the magnetic field would be for a semi cut solenoid as shown in the diagram below. The Solenoid covering is partially cut and the soft core iron in the solenoid is also cut and the number of windings in the area decrease considerbly.. The winding on either side...

[SOLVED] Amperes Law Homework Statement Deriving the magnetic field through a solenoid. Homework Equations dB = mu0/4pi x Idlsintheta/ r^2 where I = current dl= a tiny change in length dB = a tiny change in flux density sintheta is the angle to the normal r is the radius mu0 is the...

Hello! This is my first post on Physics Forums. Seems like a good community. I will endeavour to contribute. Over the next few weeks I will have to build a test rig for a fiber-optic sensor I'm developing. The sensor is for high magnetic field strengths, so the test rig must essentially...

To create a solenoid, conductive wire is coiled with n # of turns per unit length. To create a real solenoid can each coil touch the adjacent coil or does there have to be some non-conductive material between them? The reason I ask is it seems if they were touching that current would flow...

Dear all, I'm a new user to Maxwell and to FEM. I am trying to do a magnetostatic analysis for a solenoid valve for finding inductance and force on the armature. I am facing few problems while making the simulation. 1. what value shall I assign for the source? (In the tutorial provided by...

A studetn needs to make a solenoid that produses 1.09 T at its center. a wire will be wrapped around a solid cylinder of iron with a relative permeability Km of 1400, a length of 13.3 cm and a radius of 1.92 cm. if the wire can carry a max current of 1.15 A how many turns of wire are neede to...

Homework Statement I have to find an expression for the magnetic field of an elliptical solenoid. This is an actual solenoid sitting on the desk next to me, but even an infinite/very long solenoid approximation would be a wonderful start. Homework Equations Biot-Savart law The Attempt at a...

Hello, I was doing some questions and I thought I was understanding solenoids and magnets in incorrect way.. The question was, what would you feel if you bring a magnet close to a solenoid. I've wrote 2 possibilities, first is that they will repel and the second is that the solenoid would...

Homework Statement Q5. A solenoid is 3.0 cm long and has a radius of 0.50 cm. It is wrapped with 500 turns of wire carrying a current of 2.0 A. T Homework Equations Magnetic field of an ideal solenoid = permeability constant (1.257E-6) * current * number of turns The Attempt at a...

Hi to all, I have a problem to share with you guys. How can I calculate the thickness of my solenoid if I have these values; Solenoid long : 20cm magnetic field, B : 5Tesla Current, I : 20A Thanks a lot for your help. I appreciate that

hey guys, i'm currently designing a fuel system for a ramjet to be tested onbaord a sounding rocket but it's going to pull around 100g's of acceleration. i can't get a hold of the manufacturer (still waiting for an email) and the supplier here in aus hasn't got a clue if it will survive the...

Homework Statement A small 2.0-mm-diameter circular loop with R = 0.020 Ohms is at the center of a large 100-mm-diameter circular loop. Both loops lie in the same plane. The current in the outer loop changes from +1.0 A to -1.0 A in 0.10 s. What is the induced current in the inner loop...

Ok, so anyone who has studied magnetism knows that the magnetic field due to a solenoid is given by the equation B=\mu_oNI Where N is the number of turns in a given length. Well, in thinking about these, I tend not to make measurements and would rather like to predict the magnetic field of the...

suppose you have a solenoid with hollow core connected to a galvanometer. On one side you have a S-N magnet (ie. the N pole is nearer to the solenoid). On the other side you have a N-S magnet( ie. S pole is nearer to solenoid). ie. [S - N] [Solenoid] [N - S] Both magnets are...

Homework Statement A 44.0 -turn, 3.90-cm-diameter coil with R(resistance) = 0.510 surrounds a 2.40-cm-diameter solenoid. The solenoid is 16.0 long and has 240 turns. The 60 Hz current through the solenoid is I(solenoid)= 0.530Asin2\pift. Homework Equations Find the value of I(coil)...

Homework Statement A 2.1m -long solenoid is 13.0cm in diameter and consists of 2200 turns of wire. The current in the solenoid is increasing at the rate of 1.0 kA/s . The Attempt at a Solution Any help to point me in the right direction would be great. I'm thinking that i need to...

guys, here's my question: A long solenoid has circular cross section of radius R. The solenoid current is increasing, and as a result so is the magnetic field in the solenoid. The field strength is given by B = bt, where b is a constant...

simple question: is the magnetic field of uniform strength at all points inside a solenoid?

Homework Statement the flux density through a solenoid is given by B=\mu_o n I Where n is the number of turns per unit length. The number of field lines per unit area is proportional to B. I am assuming that at or near the centre of the solenoid the number of field lines per unit area...

Homework Statement A solenoid 10.0 cm in diameter and 77.2 cm long is made from copper wire of diameter 0.100 cm, with very thin insulation. The wire is wound onto a cardboard tube in a single layer, with adjacent turns touching each other. What power must be delivered to the solenoid if it is...

Magnetic field outside a solenoid in 3D(off axis) Hey all, I am modeling an inductive proximity sensor and require the formula for the magnetic field just outside a solenoid off axis. In terms of a particle's position.i.e.(x,y,z). I have searched a lot of places. But most of the results show...

1. A solenoid is 0.20 m long and consists of 100 turns of wire. At its center, the solenoid produces a magnetic field with a strength of 1.5 mT. Find the current in the coil. 2. L be the length of the solenoid = 0.2m N be the number of turns = 100 B be the magnetic field = 1.5 mT...

Hi, I have just started studying EM induction and I got stuck with the derivation of potential difference across a solenoid when the current in it is changing. My textbook (Physics for Scientists and Engineers by Tipler) derives it in very mathematical way just by saying that because the...

Hi there. On my electromagnetism test there was the following question: A long solenoid with radius R has N turns per unit length and carries a current I = I_0*cos(ωt) Find the electric field inside and outside the solenoid. I got the following solutions: \vec{E} = \frac{\mu}{2} N...

Homework Statement Find the field and direction inside a pair of coaxial coils. The inner coil carries 3.0A, has 500 loops and is 10cm long. The outer coil carries 10A, has 5000 loops and is 10cm long. Find the field at the center Thats the questions, now I don't have trouble working out the...

Hi All, I have a project and was hoping for some help here. I need to build a type of solenoid that will move a 3/4 inch diameter rod vertically about four inches and hold it there for a minute plus. This will have to be powered by a battery so energy use is a concern. I have an idea on how...

Homework Statement The solenoid has N turns of wire around a cylinder. The radius of the cylinder is "a" and length is "b." THe current of the solenoid varies as I(t)= I_{0}(1 - e^-\alphat) . I_{0} and \alpha are positive constants. Around the solenoid is a square loop of wire with side...

[b]1. Magnetic field inside a long solenoid with cross-sectional area A is given by B=(mu)nI where n is the number of turns per unit length and I is the current. Suppose that the current is given by I(t) = I(0)e^(a*t) where t is the time and a and I(0) are constants. What is the magnetic flux...

Hi all. I am now looking for a valve whose opening can be quite accurately controlled. The size of the opening shall be quite small, around 3mm - 1cm? I am wondering if you know any valve that may suit my usage? Can the opening of a solenoid valve be adjusted using electric signal?

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...

I have an air cannon, which launches a ping pong ball. The setup for this includes the reservoir, solenoid and barrel. I have to find a function for the range of the launcher. I am currently stuck at working out the downstream pressure for the solenoid. At the moment I have the mass flow rate...

I am a physicist, a young physicist. I can't find information that agrees on how to determine the magnetic field at a distance from a solenoid. We use a ferrite rod of 7.5" long wound with wire over 6.5" of it. The frequency it oscillates at is 73 kHz. If I know the current how can I...

Does anybody know how the quadv function works in matlab? I am trying to get a plot of the on axis field of a finite solenoid, so the formula (given I didn't make some stupid mistake deriving it, which is beside the point) should be: H(z) = \int_{-L/2}^{L/2} \mu_0 \frac{NI}{2L}...

Homework Statement Given: u_0 = 1.25664e-6 A 2 m long large coil with a radius of 14.6 cm and 320 turns surrounds a 4.2 m long solenoid with a radius of 4.6 cm and 7700 turns. The current in the solenoid changes as I = I_0 sin (2pi*f*t) where I_0= 30 A and f=60 Hz.Inside solenoid has...

Homework Statement There is a realistic circular solenoid of infinite length. Current I flows in it, and there are N turns per unit length. The problem asks to show that just outside the solenoid there exists a magnetic field identical in magnitude and direction as that of a single wire on the...

Hello, this is my first post here. I'm building an electromagnet as part of a larger experiment in my lab. My magnet needs to move a magnetic thread made with a paramagnetic substance. This string just barely responds to strong magnetic fields (tested it with standard speaker magnets). The...

Have you ever heard "Electric Field of one turn Solenoid? hi, guys: Have you ever heard "Electric Field of one turn Solenoid"? Here is a example from MIT. Click on the weblink: http://web.mit.edu/6.013_book/www/book.html Click on the Chapter 10 in the left part of the screen...

hi, guys: I am reading some notes of Electromagnetism. It claims that for a helix solenoid with N turns of wire, the distance between the successive coil is \Delta a, the total vertical length of the solenoid is d. The artical claims that if we apply a voltage v to this solenoid...

What exactly is the solenoid shape? Is it just the shape of the coil with the core inside or do they refer to the shape of the magnetic field surrounding the coil?? Is this the solenoid, just the coil? Or are they talking about the magnetic field that surrounds the coil?