Solenoid Definition and 705 Threads

Imagine a solenoid with n turns per length. Now, for an instant, in which everything looks static, the magnetic field inside the solenoid will be n \mu_0 I \mathbf e_z (choosing solenoid alinged with z-axis), and zero field outside. Now, what would happen if we change the current in time? To...

:rolleyes: hey guys, I'm new in the field and I'm running into this basic problem that's giving a headache. I got a pneumatic slide that's supposed to go up and down. It's controlled by a double sol, 2 position (I'm pretty sure that's the type of valve on the machine now). The valve power is...

Hello: I am having trouble starting this problem. "20.0 m long copper wire, 2.30 mm in diameter including insulation, is tightly wrapped in a single layer with adjacent coils touching, to form a solenoid of diameter 2.50 cm. What is the field at the center when the current in the wire is 26.0...

I am following the book 'Introduction to Electrodynamics' by Griffith. In that book,the magnetic field outside an infinite solenoid has been found as follows: First of all,it is proved that the magnetic field is along the axis. (I have no problems with that proof). Then,a rectangular loop is...

Hallo everybody! Is there anybody dealing with CMS stuff? Let's share infos here, and let's discuss the stuff related to Compact Muon Solenoid experiment simulations. I am a student, and have to work on H-->2mu ee- (Higgs to muon+ muon- electron positron) Plz, leave here any related...

A 40-turn, 4.0-cm-diameter coil with resistance R=.40 ohms surrounds a 3.0-cm-diameter solenoid. The solenoid is 20 cm long and has 200 turns. The 60 Hz current through the solenoid is I = I_0 * sin(2pi*f*t). What is I_0 if the maximum current in the coil is 0.20 A? Basically, there is a coil...

Hi, I want to know the difference between an actuated ball valve and a solenoid valve. Which one is more reliable? I want to program the valve so that it allows flow for 10 seconds to one outlet and after that direct the flow to the second outlet. I know I'll probably need a 3-way valve...

Homework Statement An air-filled toroidal solenoid has a mean radius of 14.5 cm and a cross-sectional area of 4.99 cm^2 (see the figure). The current flowing through it is 11.7 A, and it is desired that the energy stored within the solenoid be at least 0.388 J. What is the least number of...

what's the difference between AC and DC power source for solenoid valve?and what is mainly the power consumed for? for mature products available, what should be taken into consideration for power design? thanks

hi Guys, i am creating a solenoid gun, but my problem is that when i put my magnetized needle in the solenoid , it just stops in the midway , is there any way that my needle pass through the solenoid without stoping ( with a good speed ) i really need your help

How to tell the magnetic flux a certian distance from a solenoid?? This is about a coursework problem that I've been trying to figure out for the past few weeks. This is my context, for those wanting to know i'm trying to predict the high of the ring, in the jumping ring experiment. For...

Homework Statement In one of the problems dealing with solenoid, they gave the value of flux through the cross-section of the solenoid(say 1.6x10^(-3)Weber). Do they mean that this is the flux through a single turn of the solenoid? I get the answer if i take it this way. Homework...

Hello, I am trying to decrease the time it takes for a 24V solenoid valve to open. This can be accomplished by increasing the voltage on the coil, but I only have a 24V supply to work with, and cannot replace the coils with lower wattage versions. Is it possible to somehow boost the...

Homework Statement A long solenoid has 100 turns/cm and carries current i. An electron moves within the solenoid in a circle of radius 2.30 cm perpendicular to the solenoid axis. The speed of the electron is 0.04640c (c= speed of light). Find the current i in the solenoid B =...

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...

Maybe I'm just dense, but... I searched for forum for "solenoid" and I still haven't found the answer that I'm looking for. Mainly, I want to know if there is a general equation for the plunger force of a solenoid-type linear actuator. I understand that the force of the plunger is related...

Hi... I'm doing a solenoid for my project. But I don't know where to buy the magnet rod. I had look for a lot of place but doesn't have the magnet. Do anyone here know where can I get the magnet? Thank you.

Here's the problem I am solving: The current in a solenoid with 22 turns per centimeter is 0.50 A. The solenoid has a radius of 1.5 cm. A long, straight wire runs along the axis of the solenoid, carrying a current of 31 A. Find the magnitude of the net magnetic field a radial distance of...

(a) How many turns of wire would be on a solenoid carrying a current 4.9 A if the solenoid is 20 cm in diameter, 248 cm long, and the field at the center is 3.3 × 10-3 T? The magnetic field of a solenoid is the permeability of free space times the number of turns per unit length times...

A solenoid has a field of 1.5 T when the current is flowing in it. Its cross-sectional area is 0.30m^2. Another solenoid with 150 turns and a resistance of 20 ohms is wound tightly around the original solenoid so that both solenoids have the same cross-sectional area. The current in the first...

Hi, I'm trying to control some solenoid valves and sensors with a microcontroller and I'm not sure what type of circuitry might be used to best accomplish this. For the outputs I think a ULN2003AI made by Texas Instruments might work but for the inputs I'm not real sure what I need to take...

It is desired to construct a solenoid that has a resistance of 9.29 ohm and produces a magnetic field at its center of 0.0642 T when it carries a current of 7.32 A. The solenoid is to be constructed from copper wire having a diameter 0.895 mm. The resistivity of the copper is 1.7x10-8 ohm-m...

Hi, I am designing a solenoid driver ckt. The solenoid can hold a max force of 2.75lb. If I want my ckt drives the solenoid with max force, what current or power the ckt need to draw? Thanks for any help. Mike

Hi, Please remind me of formulas to convert the mechanical froce (lb) to electrical current (I) or power (W)? Thanks Mike

Hi everybody, I have set up a 555 monostable timer to run a solenoid for 0.05 seconds - very rapid on then off, moving the solenoid about 3 mm. I have found that it is not producing quite enough force for what I need and was wondering if I put 6 vdc solenoid in place of the 12vdc solenoid...

A 1 m long large coil with a radius of 15.2 cm and 280 turns surrounds a 7.6 m long solenoid with a radius of 5.2 cm and 3200 turns. The current in the solenoid changes as I=I_0 sin (2\pi f t) where I_0= 30 A and f=60 Hz.Inside solenoid has 3200 turns and outside coil has 3200 turns. The...

An aluminum ring of radius 5 cm and resistance 0.003 ohms is placed around the center of a long air-core solenoid with 1000 turns per meter and a smaller radius of 3 cm. If the current in the solenoid is increasing at a constant rate of 270 A/s, what is the induced current in the ring? B=...

A long solenoid with radius 'a' and 'n' turns per unit length carries a time-dependent current I(t) in the \phi direction. Find the electric field (magnitude and direction) at a distance 's' from the axis (both inside and outside the solenoid), in quasi-static approximation.What's quasi-static...

Hello, The question goes like this: A long solenoid has n turns per unit length and carries a current given by I=I₀sinωt. The solenoid has a circular cross section of radius R. Find the induced electric field at a radios r from the axis of the solenoid for (a) r<R (b) r>R Well, i got...

I'm currently part of the propulsions team for a hybrid rocket project here on campus, working on the liquid fuel injector system. Specifically I'm trying to model which injector designs give us the best burn rate over the entire burn. However, I'm a physics major, not an engineering major, so...

does anybody know why the magnetic field for a single-layer solenoid of a point in the middle of the solenoid axial field is H=[(4pini)/(10L)]*{[L+2x/[2(D^2+(L+2x)^2]^(0.5) + [L-2x/[2(D^2+(L-2x)^2]^(0.5)} where L is the length of a finite solenoid, D is the diameter

hi I need an experiment to measure magnetic filed in a solenoid. could anyone help me?

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...

http://img16.imagevenue.com/img.php?loc=loc76&image=054_doorbell1.jpg I am building a circuit such as the one above. The only difference is that it will be running for long periods of time. So heat becomes an issue. To make the most efficient and strongest electromagnet I am wondering...

Im building a big solenoid for my physics ISU and i was woundering on how it should be designed. I plan on supplying around 100-200 volts DC to it, at very low current, maby 2-7 amps. The question is this, does the solenoid have to have a specific length or number of coils, or a certain...

[FONT=Arial][B]You have a 12 volt car battery and a supply of #18 gauge copper wire. If you make a solenoid 30cm long and 8cm in diameter, winding two layers of wire along the length of the solenoid, what will be the strength of the magnetic field at teh center of teh solenoid when connected to...

I want to make a very powerful one stage solenoid. The pipe is only so long , so if I wrap the wire evenly I will only achieve a fixed number of turns. If I wrap the same wire of that one with the current flowing in the same directon I should get twice as many turns altogether. The problem is I...

i received this problem from my lecturer A solenoid is wound with 2200 turns per meter, and carries a current 2.5A. Take the axis of the solenoid to the solenoid to be parallel to the z-axis. A magnetic dipole moment given (m)=(20A.m^2)i+ (30A.m^2)k is located inside the solenoid. i)how...

As a college student I have a lot of extra soda cans around I thought it would be neat to tryto have some fun with them. What I would like to do is make some sort of solenoid or system of solenoids that would launch a soda can. What I am wondering is if an aluminum can is afected at all by the...

I need help! I am unsure of what to do. A solenoid 1.33 m long and 0.0260 m in diameter carries a current of 17.8 A. The magnetic field inside the solenoid is 22.4 mT. Find the length of the wire forming the solenoid. The only information I have is the equation B=(Mu sub 0)*n*i Where...

I can`t seem to find any information on how to calculate the magnetic field outside a real finite solenoid. I do not need the field on-axis, but rather perpendicular to the solenoid. Any ideas on how to proceed, or suggestions to literature? Thanks Indian

Hi! I need formula for magnetic field of solenoid on axis of solenoid in some distance from center.Also I need something about interaction magnetic field on material point(interaction solenoid on material point).I want to know force that infuence on material point. Thx in advance and sry for my...

Hi, I have a question as follows. For an infinite solenoid with magnetic flux \Phi, for what values of \Phi "is the quantum mechanical motion of an electron constrained to stray far from the solenoid exactly the same as it would be if \Phi were zero"? Solution: \Phi = n \Phi_{o} with n =...

i've found a lot of equations and relations about solenoids where the lengh tis always much greater than the radius, but what if the radius was much greater than the length? PS. also does anyone know an equation that could help me figure out the magnetic field strength outside a solenoid? or...

Lets say there is a single loop of wire. Is the B field at exactly of the plane of the loop going to all be perpendicular and of constant magnitude, at exactly the plane of the loop. I know this is true for the center. Doesnt it also hold for points off center of the loops axis, as long as we...

A light bulb and a solenoid are connected in series to a battery. An iron rod is thrust rapidly into the solenoid and later rapidly removed. The bulb: 1)No change in or out 2)No change in, brightens out 3)Dims in, Dims out 4)Brightens in, dims out 5)Brightens in, brightens out 6)remains...

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...

According to which law the magnetic field of the solenoid can be represented by the voltage induced in the search coil ? :rolleyes: :biggrin:

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 I have scoured the internet trying to find the right expression to calculate the magnetic field (B) outside of an AC driven solenoid. All i keep getting is stuff for DC driven or inside the solenoid. Can anyone help? thanks Craig