Solenoid Definition and 752 Threads

Homework Statement Can I derive an equation for magnetic field inside a solenoid using the formula for magnetic field on the axis of a current carrying coil? Homework Equations B = μI/2r ( Magnetic field at the centre of a current carrying coil)The Attempt at a Solution B = μI/2r Let the...

I am trying to build a circuit using gears, motors, and relays only which mimics the motion of a proportional linear solenoid i.e. Hold a spring compressed at a certain distance depending on the current passed, and push/ release it further based on the increase/ decrease of current. (V=12 V...

The Solenoids which are used for pneumatic controller uses the solenoid as a switch to control the value opening and closing. This is done by passing current to through the coil which produces the magnetic field . But i would like to know how the generated magnetic field will move the solenoid rod?

I need to select a solenoid actuator for tensioning a chain. The chain is for a bobbin which rotates at 100 rpm. The weight of the bobbin is 9081 kgs. I calculated the braking torque of 35 KN-m but as my knowledge is very limited for solenoids i wish to know how can i select a solenoid for this...

Homework Statement The current in a solenoid (you may treat it as a long solenoid of length 2.0 m, turns, and radius 0.5 m) is decreasing at a rate of 1.7 A/s. What is the EMF at a point .35m inside the solenoid? Homework Equations B=N(mu_0*I)/(2a) where B=magnetic field, N=turns per...

The notion of multiplying the current in each loop in a toroid or solenoid with the total number of loops in order to find out the net current in the toroid or solenoid is appearing a bit confusing. Why do we do this when we know the same current is flowing through each loop (just like water...

I am curious if an alternating solenoid coil needs to be wound with a single piece of wire from end to end, or - can each loop in the solenoid be made of a separate wire and stacked on top of the previous, as long as each termination is connected to the proper + / - terminal. Essentially - is...

Hello, I am trying to find out the electric field inside a solenoid if a time varying current is passed through. However I am stuck with these partial differential equations. Somehow I can't solve them and I think something is wrong. Because according to equation (13) the electric field will...

I've been looking for a good formula to calculate the inductance of a multilayer solenoid within about 10% accuracy or greater. I've used several formulas derived from Wheeler's formula, as well as a few online calculators, however, my results seem to differ wildly depending on what formula or...

Hi, I am trying to redesign a system that's already avialable. It contains a small metal rod hanging in mid air between 2 magnet(permanent). There is a solenoid that let's it move to and fro when current is passed. And then there is a spring to limit the movement of the metal rod due to...

Heey guys, I have a problem. I want to calculate the minimum time i have to activate a (latching)solenoid so that its final velocity is 0 m/s when it hits the inside. Well I know the following things: F= m*a I know the force and the mass, so a can be calculated. V = a*t. the average...

Homework Statement A cylindrical shell of radius a and length 2L is aligned around the z-axis from z= -L ot z = +L. A current I is distributed uniformly on the cylinder and moves around the cylinder's z-axis. Find the magnitude of the magnetic field at the origin. Homework Equations...

Hello so I just want to make sure I Am doing this correctly. also I know there is a magnetic field force formula. That is F= qv (dot) B How would I go about using that formula with the magnetic field I created from the solenoid in the picture? Thanks for any help! Zig

Hello everyone, I have a few projects in mind that call for various sized solenoids. I have been experimenting with various gauges of magnet wire, however, every time the battery is connected, it gets too hot to hold. with that being said, is there a way to calculate how...

Hi everyone. I was doing an experiment on the effects of varying the distance between the solenoid and magnet, the voltage across the solenoid, and temperature of the iron core inside the solenoid on the magnetic field produced and the magnetic repulsion between the solenoid and magnet...

I have been working on a solenoid for different applications, but cannot find the desired output. I have a bobbin or hollow shell that houses a shaft that is split in half. At the center of this shaft is a spring, and when the solenoid is activated the spring is depressed, the two pieces of...

what is the formula for force between current carrying solenoid (both cylindrical and toroidal ) and a permanent magnet.

Homework Statement An 85 mH solenoid inductor is wound on a form 0.80 m in length and 0.10 m in diameter. A coil is tightly wound around the solenoid at its center. The coil resistance is 8.1 ohms. The mutual inductance of the coil and solenoid is 27 µH. At a given instant, the current in the...

Hi I am designing a solenoid to interact with a magnetite-powder tip. I can't find specifications about the magnetite I am using, and properties seem to depend on factors I don't know. Could you give me a rough estimate (just order of magnitude is fine) of the force give a certain magnetic...

Homework Statement Grad student here, reviewing for my quals. It's been awhile since E&M and I think I need a refresher since this problem has me stumped. A planar circuit surrounds a solenoid and consists of two capacitors of capacitances C_1 and C_2 joined together by normal wires. The...

Let's say I have a magnetic ball within a solenoid that has current passing through it. How would I calculate the magnetic force on the ball?

Homework Statement Explain the location of the poles of the electromagnet. Homework Equations RHR The Attempt at a Solution Is this correct?or are the poles opposite of what they are meant to be. I believe it is south on the left a confirmation would be great thank you :)

So I want to fire a magnetic ball through a solenoid coil but want to know if core material can enhance the performance. Would wire wrapped around soft Iron tube core work better then say a thin copper tube? The aim is to increase efficiency so less power needs to be used to fire the magnetic...

Homework Statement Find the magnetic field generated at the center of a coil of wire with N turns, a radius of r, and a current I running through it Relevant equations B=μ0nI, where n=N/L (L is the total length of the coil) The attempt at a solution B=μ0nI B=μ0I(N/L) L=2πrN B=(μ0NI)/(2πrN)...

Homework Statement Hello, The question of the problem is: Solenoid, calculate laps of a proton? Someone could help me solve this exercise, but I try not to do this achievement . Would appreciate your help . This is the information that I provided to do the exercise: Picture of the year ...

Hi, what differences are if i use a pvc tube to build an actuator(solenoid with plunger) or alluminium? Alluminium can intensify magnetic field? but the plunger will stick with alluminium? or solenoid will have less force?

Homework Statement The problem give is: A solenoid has N=500 windings, radius a=.1 m and a height h = .6m; the current is found to be decreasing according to I(t) = Io - bt, where Io = .4 amps and b = .2 amps/second. Calculate the rate at which electromagnetic energy is leaving the solenoid...

I need to project a solenoid. But i have some questions: - How much need to be thick enamelled copper? How i can calculate the thickness necessary? (to not burn solenoid wire) - Will be good enamelled alluminium too? This if i suppose to power it with 10A, 2000turns. And: - How i can power...

Homework Statement A small, thin coil with N2 loops, each of area A2, is placed inside a long solenoid, near its center. The solenoid has N1 loops in its length L and has area A1. Find the mutual inductance as a function of θ, the angle between the plane of the small coil and the axis of the...

Homework Statement Hi again guys, been stuck on this problem for a while now, thought it would be a simple bumping in some values in a given equation question but I can't get the correct answer :confused: Heres the problem: What is the inductance of a 600 turn coil wound on a core of cross...

I would like to know whether it is ok to use 220V Solenoid Valve in a 230V Environment. This is the Valve I am taking about. This is the Circuit I am going to make with this. http://www.electroschematics.com/6161/power-switch-with-infrared-proximity-sensor/ Thanks in Advance :)

Hello, I'm an electrical engineer dipping my foot into solenoids as part of a project here at work.To monitor the position of the solenoid's armature I have a linear pot installed. My is issue revolves around a flyback diode installed across a DC solenoid I am testing. I am low side switching...

Homework Statement A coil with 150 turns, a radius of 5.0 cm, and a resistance of 12 Ω surrounds a solenoid with 300 turns/cm and a radius of 4.3cm; see the figure. The current in the solenoid changes at a constant rate from 0 to 1.8 A in 0.12 s. Homework Equations B from solenoid =...

Consider a solenoid of length l, no. of turns N, n = N/l, area A, and negligible resistance. In its middle is placed a single-turn loop of same area (well, slightly smaller) in the solenoid's middle. The loop has, for the moment, a very high resistance so there is no appreciable loop current...

suppose a solenoid has N turns What is the Flux through the Solenoid? similarly if a coil has N turns , what is the flux through the whole coil? i know how to find flux through a given AREA,,,like a coil with just 1 turn... How do u find flux for the entire system?

Homework Statement An electron circles at a speed of 8510 m/s in a radius of 2.42 cm in a solenoid. The magnetic field of the solenoid is perpendicular to the plane of the electron’s path. Find the current in the solenoid if it has 23.3 turns/cm. Answer in units of mA Homework...

Hi everyone. I'm having a relatively hard time in understanding Griffith's explanation of why the radial component of a magnetic field of a solenoid should be zero. He says, "If B(r) were positive, if we reversed the direction of the current, B(r) would be negative. But switching I is...

Homework Statement You have a 1.0 m long copper wire. You want to make an N turn current loop that generates a 1.0 mT magnetic field at the centre when the current is 1.0 A. You must use the entire wire. What will be the diameter of your coil (in centimetres)? Homework Equations...

Homework Statement A solenoid has a radius of 1.85 cm and 1110 turns per meter. Over a certain time interval the current varies with time according to the expression I = 2.50t, where I is in amperes and t is in seconds. Calculate the electric field 5.47 cm from the axis of the solenoid...

Homework Statement A solenoid has a radius of 2.10 cm and 1180 turns per meter. Over a certain time interval the current varies with time according to the expression I = 1.30t, where I is in amperes and t is in seconds. Calculate the electric field 4.65 cm from the axis of the solenoid...

Homework Statement I am designing a solenoid for a project to meet several specifications. I am attempting to induce an emf of approximately 2V in my circuit by moving a magnet in and out of the coil. I know the magnet has an approximate field strength of 1T. I am trying to determine necessary...

Homework Statement A solenoid has length L = 2.0m, radius R = 28.0cm, field strength B = 2.7T. The field is maintained by superconducting wires, with cross section 2mm x 2mm, wound with a 2mm spacing between windings and 20 layers of winding. Use the result that the current is I = 215A. a. If...

Homework Statement Hi everyone, the problem I'm stuck on reads: " Imagine a solenoid 3m in diameter, 5m long having 1164 turns of super conducting cable. What length of super conducting cable is used to wind this solenoid?"Homework Equations Circumference = 2pi*radiusThe Attempt at a Solution...

Homework Statement A solenoid of length L and radius R lies on the y-axis between y=0 and y=L and contains N closely spaced turns carrying a steady current I. Find the magnetic field at a point along the axis as a function of distance a from the end of the solenoid. Homework Equations...

A compass is placed near a solenoid. It is closer to the North pole generated by the coil. The magnetic north is 90 deg relative to the compass and the solenoid. The strength of the solenoid is equal to the strength of the magnetic north. In which direction will the compass needle point?

Homework Statement Problem: A Solenoid has N turns of Copper wire (Cross-section area of the wire is 10-6 m2) The Length of the solenoid is 25*10-2 m and its Resistance is 0.5 Ω. What's the Self-Inductance of the solenoid? Homework Equations Given answer: 5.5*10-5 H Please help me with...

Briefly, a solenoid valve utilizes a solenoid to move a soft iron core in such a way as to open/close an orifice to allow/inhibit flow of a fluid. I am a bit rusty on my E&M and I have a couple questions about this operation. 1) When a magnetic field is created using the solenoid, the soft...

Briefly, a solenoid valve utilizes a solenoid to move a soft iron core in such a way as to open/close an orifice to allow/inhibit flow of a fluid. I am a bit rusty on my E&M and I have a couple questions about this operation. 1) When a magnetic field is created using the solenoid, the soft...

Hello, The problem I am struggling with is this You are designing an electromagnet capable of producing a magnetic induction field of 1 T by winding a solenoid around a long cylinder. A solenoid is typically wound by starting at one end of the cylinder and placing loop after loop directly next...

I want to purchase a push out solenoid for throwing stuff into air and need help deciding the best one... I want to push 4kg of load into air at 90degress starting from rest to a height of atleast 3 metres. How much force(in Newtons ) would that need ? Also if you could explain the method you...