Solenoid Definition and 705 Threads

Homework Statement Calculate the energy associated with the magnetic field of a 191-turn solenoid in which a current of 1.37 A produces a magnetic flux of 3.52 10-4 T · m2 in each turn. mJ uo=4pie x10^-7 Homework Equations ub=B^2/2uo(the constant) U=1/2LI^2 The Attempt at a...

Please note, I'm not in school anymore -- just a basic physics question! Homework Statement A conductor is placed inside the coil of an induction heater. Imagine that the inductor coil has radius R, number of turns N, operating frequency f [Hz], drawing current I = I0 * sin(2*pi*f*t). The...

A 29.8 mA current is carried by a uniformly wound air-core solenoid with 390 turns. the length of the coil is 13.1 cm, with a diameter of 20.8mm. The permeability of free space is 1.25664 X 10^(-6) N/A^2 compute the magnetic field inside the solenoid. answer in units of T Relevant...

Homework Statement The Attempt at a Solution Suppose that N pole of magnet is facing the solenoid considering view from magnet when the magnet moves close ... current is anticlockwise and increase from 0 to max till magnet reach starting of solenoid when it enters the solenoid ...

Homework Statement A long circular solenoid of radius a and N turns per unit length has its axis in the z direction. A small highly conducting ring, or area A, resistance zero but self inductance L, is place with its plane horizontal and its centre on the axis and near the top of the...

Can someone please tell me why the formula for B at the center of a coil and the formula for B inside a solenoid give widely different answers in this problem? From Serway and Vuille, College Physics: "A solenoid with 500 turns, 0.10 m long, carrying a current of 4.0 A and with a radius of...

Homework Statement A 0.100m long solenoid has a radius of 0.05m and 15000 turns. The current in the solenoid changes at a rate of 6.0 A/s. A conducting loop of radius 0.0200m is placed at the center of the solenoid with its axis the same as that of the solenoid. Determine the mutual...

This is driving me insane. This is all I can think of to do, and my teacher said it was wrong. A solenoid of length 0.25m and radius 0.025m is comprised of 440 turns of wire. Determine the magnitude of the magnetic field at the center of the solenoid when it carries a current of 12 A...

Can a loop of wire be considered a solenoid, which has been turned once? -Thanks.

Homework Statement Two metallic rings A and B, identical in shape and size but of different resistivities Pa and Pb are kept of the top of two identical vertical solenoids. When current I is switched on in both the solenoids in an identical manner, the rings A and B jump to heights ha and hb...

Homework Statement A point charge q is a distance a > R from the axis of an infinite solenoid (radius R, n turns per unit length, current I). Find the linear momentum and the angular momentum in the fields. (Put q on the x axis, with the solenoid along z; treat the solenoid as a nonconductor...

Homework Statement Explain why the contribution of B°dl of the magnetic field at sections b and d of the enclosure length must be zero, even inside the solenoid. Homework Equations Ampere's Law: ∮ B dl= U_0 I_enclosed NThe Attempt at a Solution The right and left sides of the loop have a...

1.A student performs an expierment on a soenoid. The solenoid is open circuit in the first instance, the studet then pushes a magnet into one end with a constant force. the second instance, the solenoid is connected to a galvanometer. Using the concept of energy conversion, relate and explain...

I am using a DC push-type solenoid as the mechanism for shooting in my robotics project. I have to use 12V DC supply and have to shoot TT balls for distances upto 3-7 feet. The solenoid specifications suggest that it requires 60 amp current. How do i generate this?? Thanks in advance

Hello, I am doing a solenoid experiment, where I will be examining e.m.f, flux density, Flux, Magnetic field strength, electric field strength, etc... but I have no apparatus or the equipment with me. I was wondering whether someone who has got the equipment could correct all the data for me...

I am trying to figure out how the TEM wave looks like and how it propagate outward. Attached is a pdf of a drawing with only the solenoid and show the winding that the current is flowing in CCW and a reference. Also I draw a loop with one resistor and show the induced current and the polarity of...

I m designing an electro-mechanical solenoid as the shooting mechanism in a robot. Its input is DC current. But, my guide asks me to mention its voltage rating. What is this and how to find it out?

Can we find an electric field in a solenoid? Just a little confused

Where is magnetic field strongest in a solenoid?

Homework Statement Hi! Yesterday was the deadline of a monthly competition, and I couldn't solve one problem. Please take a look at it: http://www.komal.hu/verseny/feladat.cgi?a=honap&h=201011&t=fiz&l=en" It's the last problem, worth 6 points with the image of a solenoid Homework...

Part of a new product we're designing needs a small iron-core D.C. electromagnet for an actuator. I designed the electromagnet's core to be circular: about 4.5mm in diameter with 200 Ampere-Turns in the coil. An axis-symmetric FEA showed the iron core to be near saturation, and producing a...

Homework Statement Question: A solenoid has of radius 100mm and turns density of 5 turns/mm has a current of 10 Amps flowing in it. There is a loop of radius 15mm and 25 turns within the solenoid. The loop is free to rotate about an axis which is normal to the axis of the solenoid...

Someone please explain me why is the magnetic field at a point outside a current carrying solenoid 0? I read many books but can't understand what they mean. I understood that the magnetic field at a point in between to adjacent coils is 0 as the 2 fields oppose each other. Why and how is it 0...

Homework Statement We have a solenoid of radius a, length L, with ends at z = +/- L/2. The problem is to use Ampere's law to show that the longitudinal magnetic induction just outside the coil is approximately B_z (\rho=a^+, z) \approx \left(\frac{2 \mu_0 N I a^2}{L^2} \right) \left(1+...

Homework Statement There is a solenoid with a magnetic field of a constant magnitude B. In this solenoid is a charged particle, initially at rest, at a certain distance r from the axis of the solenoid. After a certain amount of time, the magnetic field is instantaneously flipped in direction...

When I have an infinite solenoid , The b field lines point straight up the solenoid and the field is zero outside. But i thought that the field lines have to wrap back around on themselves. Does this not apply in this example . Or am i crazy?

1. Can a solenoid connected to alternating current generator be used as transmitter of electromagnetic radiation? 2. Can a solenoid be used as a receiver of electromagnetic waves? I think point 2. is possible, since alternating magnetic field will induce voltage in the loops of solenoid...

Homework Statement There is an infinetly long solenoid with current I, radius R, and N loops/unit length. Find the B field in the axis of the solenoid. Homework Equations The Attempt at a Solution So that eq. can be narrowed to B integral dl = Uo I the only problem is...

The magnetic flux density B( in tesla ) inside the solenoid and parallel to its axis is given by the expression B= permeability of free space x n x I, where n is the number of turns per metre length of the solenoid my question is so for example, if n = 100turns in 1m and I = 2Ampere...

Hi all Physics (masters) I was reading a paper on the faraday's induction experiments; i didn't quite understood the reason why is current induced into a solenoid. There is this solonoid and a Permanant magent is pushed inside the solonoid and we observe that a current flows (by a...

A solenoid of radius 0.0523m is made of a long piece of wire of radius 0.002432m, length 54.0m, and resistivity 7.4x10^-9 \Omegam. The solenoid is closely wound with a single wire thickness. The permeability of free space is 1.25664x10^-6 Tm/A. Find the magnetic field at the center of the...

How many turns of wire would be on a solenoid carrying a current 4.9 A if the solenoid is 17 cm in diameter, 248 cm long, and the field at the center is 2.9 × 10-3 T? I can't seem to get the right answer... I plug the values into B=n*u0*I and then solve for N. I know that n=N/length

Homework Statement 1. Homework Statement A 20cm long solenoid has 4000 turns of wire. Insiude this solenoid is a second on, also 20cmlong but with 2500 turns of wire. If a 2.5 A current flows in each solenoid in the same directon, what is the magnetic field inside the inner solenoid...

We are currently learning about solenoids in my physics class, and am very confused about where this potential drop comes from across a solenoid. I understand that an opposing electric field is created when a switch is first opened because of Faradays Law and the fact that the magnetic flux...

Homework Statement A soft iron bar in a solenoid is placed in a circuit. There are two compasses, 1 is on the West side of the iron bar and the other is to the North. The circuit switch is open, which way will be compass needles be pointing? Which way will the compass needles be pointing if...

I wanted to know how the magnetic field of a solenoid would be affected if a copper/iron pipe section was put into its center. In other words, what would the resulting magnetic field be if I simply wrapped a coil around a metal pipe section without removing the pipe afterward? Will there be...

Say I have an ideal (long and tightly wound) solenoid, and I put a ring of wire around it (large ring). Then, by Faraday's law, if I put a current through the solenoid there will be an induced current in the wire ring around the solenoid. But if there are no B-field lines crossing my ring of...

Homework Statement Solenoid is 1.8m long and 75 cm in diam. one layer tightly wound with wire that has diam 2mm. what current needs to run thru to get 1.5T Homework Equations N=2piR/(L) where R is radius of solenoid and L is wire lenght The Attempt at a Solution Once I find how...

Homework Statement You have 12m of 0.50mm diameter copper wire and a power supply capable of passing 17A through the wire. What magnetic field strength would you obtain inside a 2.0-mm-diameter solenoid with the wire spaced as closely as possible? Homework Equations The Attempt...

Homework Statement You have 12m of 0.50mm diameter copper wire and a power supply capable of passing 17A through the wire. a)What magnetic field strength would you obtain inside a 2.0cm diameter solenoid with the wire spaced as closely as possible? b)What magnetic field strength would you...

Homework Statement You have 12m of 0.50mm diameter copper wire and a power supply capable of passing 17A through the wire. What magnetic field strength would you obtain inside a 2.0cm diameter solenoid with the wire spaced as closely as possible?Homework Equations B=u0nIThe Attempt at a...

Hi, I've have been searching for help in calculating the magnetic field strength at any given position outside a solenoid. I can use Biot-Savart's to get the field along the axis of the solenoid but how does the field vary perpendicular to the axis of the solenoid, for example. Rob

According to widely known formulas, the inductance of a long straight solenoid will remain practically the same if we bend it into a toroidal solenoid. It seems to be a contradiction, because the magnetic path length of a straight solenoid is more than two times greater.

I have a solenoid which has a current passing through it which increases linearly with time. I have proved that the energy stored in the magnetic field is equal to the energy being pumped in according to the surface integral of the poynting vector. This implies the energy stored in the electric...

Can anyone explain the concept behind changing of inductance of a solenoid (when AC current is passing through solenoid) on moving a metal sleeve (hollow metallic pipe) over the solenoid enclosing the solenoid.

Hi, I've been trying to learn about iron core solenoids and I'm having trouble finding information on a concept (probably obvious but I'm new to this). I've been looking at the equations for iron core solenoids online, and it's alluded to that these equations only hold true when the proportion...

Homework Statement Thin Shell Solenoid Homework Equations General Case Formula Found: http://www.netdenizen.com/emagnet/solenoids/thinsolenoid.htm" The Attempt at a Solutionplugged in variables and got .00062919475 T 4 other attempts were made using trivial solutions. Even tried finding...

I have a toy that is mounted 4 feet above the floor on which there are 3 pushbutton DSTP switches that I would like to actuate intermittently with my feet. I believe that I can do this by building a device that pairs 3 appropriately positioned solenoids with 3 momentary SPDT footswitches all...

Dear all I just joint with the group, I want to make solenoid self. I need plunger moving more 100 times/s, with strong force. anyone can help me to make this solenoid? and what material are suitable to make it? thanks for attention

Hello I have a problem that I can't understand... I am putting kerosene pressurised to 160psi through a 1/4" BSP solenoid with 13mm orifice. On the out port of the solenoid is a 1/4" BSP to 2mm ID nozzle. The idea is it sprays out a stream of kerosene. The kerosene is provided by...