Magnetic flux Definition and 353 Threads

Homework Statement A solenoid 1.7 cm in diameter and 30 cm in length has 4000 turns and carries a current of 5 A. Calculate the magnetic flux(in Wb) through the circular cross-sectional area of the solenoid. Since this is a very long solenoid, you may use the simplified magnetic field formula...

Homework Statement If a loop of wire starts off horizontal, in a magnetic field angled 12º from the normal to the surface of the loop, and then rotates 180º in a constant magnetic field of magnitude B, what is the magnitude of the change in magnetic flux? Homework Equations Flux = A.B...

Homework Statement The setup is a pair of two circular wires, a small one of radius b and a large one with radius 2b, both sharing the same center and located on the same plane. There is a magnetic field of strength B within the smaller circle that comes out of the paper towards the observer...

Homework Statement Use the law of electromagnetic induction to deduce what typical voltage would be imposed in the magnetopause by the interplanetary magnetic field, assuming a scale size of the magnetopause of 10Re? Homework Equations -Magnetic flux equation -Faraday's law...

Is it possible to have magnetic flux through an open surface ? i mean if there is a circular arc and magnetic field at the centre changes with time then will there be any induced emf in the arc ?

Homework Statement First part of the question: A rectangular loop is placed near a long straight conductor. Conductor is oriented vertically to the XY plain at the origin the loop is contained within the YZ plain. Current passing through conductor. I = 19 Ampere dimensions of the loop...

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 1350 turns per meter and a diameter of 5.55 cm, and carries a current of 2.20A Homework...

I am studying inductance. Can the core flux be added to or suppressed by the secondary of a transformer. I have been taught that there is only one core flux field. I understand that flux can be squeezed or attracted, I am I correct in stating; a primary current is opposed by a back current...

Is it possible to... Minimize the distance the flux travels in the x-axis from the centre of a magnet. (in 2d representation) Ive attached an cross-section image detailing what I'd like to happen. A "shield" is wrapped around the magnet, leaving only the N and S poles exposed. The flux is...

A circular loop (with a radius of 10 cm) rotattes in a constant magnetic fiels, which has a magnitude of 1 T. At an instant when the angle between the magnetic field and the normal axis (to the plane of the loop) is equal to 10 degrees and is increasing at a rate of 20 degrees/s, what is the...

Homework Statement A current flows in a circular loop consisting of a single turn.If the same wire is bent into a circular loop of 2 turns and the same current is passed through the loop,the magnetic flux density at the centre will change by a factor of ...? (ans: 4 ) Relevant equations B...

Homework Statement The magnetic field in a certain region is given by B=<40i-18k>T. How much flux passes through a 5cm^2 area loop in this region if the loop lies flat in the xy plane? Homework Equations Flux=B.A The Attempt at a Solution I got the answer (90 * 10^-4) in...

Homework Equations ? The Attempt at a Solution ?

I would like to put this out for argument that there is no such thing as magnetic flux density. Since magnetism is a wave like on water's surface, it is continuous. Is there a 'water wave density?" I think not. Unless you mean the distance between wave peaks. But flux lines are only arbitrary...

Homework Statement A 10 cm x 10 cm square is bent at a 90° angle . A uniform 0.050 T magnetic field points downward at a 45° angle. What is the magnetic flux through the loop? Homework Equations Φ = AB cos θ Φ = (pi * r^2)B cos θ The Attempt at a Solution b = .050 T cosθ =...

When two magnets are taped together with both north sides touching does the magnetic flux stay in its normal possition or does it bend, if it does in what way does it bend?

Homework Statement We are studying Electromagnetic Induction right now. I understand the concepts, Faraday's Law and magnetic flux. But I don't understand what my book is doing. Homework Equations Magnetic Flux \phi=\intB∙dA Faraday's Law Emf = - d\phi/dt Emf=Electromotive force \phi=Magnetic...

Homework Statement ** What do we mean by saying: A)) The magnetic flux = 3 webber The quantity of magnetism, taking into account the strength and the extent of a magnetic field equal 3 webber ?? is that correct? B)) The magnetic flus density in C point = 2 tesla the amount of magnetic...

epsilon=-\frac{d \Phi}{dt} where epsilon is the emf. the emf produces a current in the oppostite direction to the loop which gives a magnetic field opposing ther external field B. my notes then say \frac{d \Phi}{dt}>0 \Rightarrow \frac{d \Phi_{Induced}}{dt}<0 but i don't understand this...

1. At a certain location, the Earth's magnetic field has a magnitude of 5.6x10-5 T and points in a direction that is 72 degrees below the horizontal. FInd the magnitude of the magnetic flux through the top of a desk at this location that measures 110 cm by 57 cm. 2. I used the formula \Phi = BA...

Homework Statement A circular wire loop of radius r= 19 cm is immersed in a uniform magnetic field B= 0.670 T with its plane normal to the direction of the field. If the field magnitude then decreases at a constant rate of −1.2×10−2 , at what rate should increase so that the...

Homework Statement The magnetic field inside a cylindrical solenoid of area 4 cm^2 is 0.15 T along the axis of the solenoid. What is the magnetic flux through a disk of radius 3 cm placed perpendicular to the solenoid axis? Homework Equations \phi = \zeta B * dA The Attempt at a...

Homework Statement For my physics investigation I am required to first find the theoretical magnetic flux denisty at different points about a solenoid. The points are outside the solenoid: along the axis but past the ends and; perpendicular to the centre of the solenoid but outside. So far...

Homework Statement A 10cm x 10cm square is bent at a 90deg angle as shown in the figure. A uniform 0.050T magnetic field points downdard at 45deg. What is the magnetic flux through the loop. Homework Equations Flux= [(Aeff)*(B)]. Flux= [(Aeff)*(B)]*cos(theta). The Attempt at...

Homework Statement Estimate the magnetic flux (due to the Earth's field) through your body (back to front) if you stand facing North. What will be the net change in flux if you turn and face South? Homework Equations Gauss's Law and variants \oint E\bullet dA The Attempt at a...

Homework Statement The drawing shows a bar magnet falling through a metal ring. In part a the ring is solid all the way around, but in part b it has been cut through. (a) Explain why the motion of the magnet in part a is retarded when the magnet is above the ring and below the ring as well...

Concept of an "area vector" when finding magnetic flux Hello, I'm currently learning basic Electromagnetic Induction, specifically induced emf in a loop. According to my textbook, magnetic flux is defined as: \Phi = BA cos \theta Given that the field is uniform and is traveling through a...

Homework Statement The e.m.f E of a battery is given by E = \frac{P}{I} where P is the power supplied from the battery when current I flows through it. An e.m.f. {E_c} can also be induced in a coil when the magnetic flux, \Phi , associated with it changes with time, t, as expressed by {E_c} =...

How many magnetic flux quanta exist within the ground state hydrogen atom? Thanks in advance.

See attached problem: http://img72.imageshack.us/img72/4791/65321158jp4.th.jpg The answer is 6.9 × 10−4 Wb - by multiplying the Area by the magentic flux density. Mq is, why does one not multiply this by 850 (number of turns) in order to find the answer. Thanks

A coil is located at the center of a long solenoid of radius R = 15cm which has 5x10^7 turns per meter and carries a current I = 16A. The coil is coaxial with the solenoid and consists of 5 turns of wire each in the shape of a square of length a = 5cm on each side.What is the magnetic flux...

Homework Statement Infinite wire on Z axis Loop radius a lies in x,z plane, centered on positive x axis, with center a distance b away from origin. Find flux through loop. Homework Equations B field => from the infinite wire, dependent on 1/rho, in the (phi) direction, =...

Inductance & magnetic flux problem -- please help Homework Statement The magnetic field of a place on Earth has strength 55 microTesla and is tilted 60 degrees below horizontal. A 200 turn coil with diameter 4cm and resistance 2 ohms is connected to a 1 microFarad capacitor. The coil is...

Homework Statement At the equator, the earth’s magnetic field is approximately horizontal, is directed towards the north and has a value of 8 × 10^{-5} T. (i) Estimate the EMF induced between the top and bottom of a bullet shot horizontally at a target on the equator if the bullet is...

Homework Statement Find the magnetic flux through a solenoid of length 31.2 cm, radius 1.5 cm, and 610 turns that carries a current of 3.8 A. (in Wb) Homework Equations B_solenoid=u0*N*I/L Flux= B *A The Attempt at a Solution So to find the magnetic field, I plugged the...

A figure has a 3.0T magnetic field that is normal to the plane of a conducting, circular loop with a resistance of 1.5 ohms and a radius of .024m. The magnetic field is directed out of the paper. The area of the non-circular portion of the wire is considered negligible compared to that of the...

Homework Statement A single coil with a radius of .02m is placed inside a 3m long solenoid that has 600 turns. The radius of the solenoid is 0.15m. The plane of the coil is perpendicular to the axis of the solenoid. The solenoid is connected to a battery, an ammeter and a switch. The ammeter...

Homework Statement A long, straight wire carrying a current of 3.00 A is placed along the axis of a cylinder of radius 0.500 m and a length of 5.00 m. Determine the total magnetic flux through the cylinder. Homework Equations flux=BAcostheta The Attempt at a Solution i found the...

Magnetic flux! Homework Statement Find the flux of Earth's magnetic field of magnitude 5.00 10-5 T through a square loop of area 40.0 cm2 for the following: (a) when the field is perpendicular to the plane of the loop (b) when the field makes a 20.0° angle with the normal to the...

Homework Statement A solenoid has 235 turns of wire wrapped along its length of 27 cm. The diameter of the solenoid is 1.5 cm. In the middle of the solenoid is a smaller coil of diameter 1.0 cm with 50 turns of wire along its 2.0 cm length. The two coils are coaxial. A current of 15 A is in...

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...

http://img.photobucket.com/albums/v235/gsan_bot/magnetic1.jpg" Refer to example 6.2 shown in the picture, the magnetic flux = -1.2t and the deriative time of magnetic flux should be -1.2, thus, the flux is decreasing and the direction of the induced current should be reverse. but why it say...

Homework Statement This is from my textbook Engineering Electromagnetics by John Buck and William Hayt 7th Edn, pg 238 in the chapter titled "The Steady Magnetic Field": Homework Equations Divergence theorem: \oint_S \textbf{B} \cdot d\textbf{S} = \int_{\mbox{vol}} \nabla \cdot...

Hello everyone, In the magnetic flux formula in our textbook it says Ø = BAcosø and somewhere else I saw it as Ø=BAsinø. I don't know which one to use. If F=BIL sinø why does magnetic flux have cos in it formula. If something is perpendicular don't we have to use sine. Any help would be...

Homework Statement http://img164.imageshack.us/img164/3313/qqqqo3.jpg Find the total magnetic flux through the coil at t=0 Given that the rate of change of flux at any time,t, is equal to 2 \pi f \phi sin 2 \pi ft, find the maximum instanteous value of the induced emf at any time & the...

If we have a metal wire and a magnetic field "inside" it, when the flux of the magnetic field changes, then the wire "reacts" by "creating" an induced current. After learning this law, it eventually came to my mind the question: how does the wire know that the magnetic field flux has changed...

Homework Statement 1.) Problem (exam question that I got wrong and want to figure it out) A circluar coil of radius a=.35m rotates at a frequency of 120 hz in a constant magnetic filed of B=.8T. The axis of rotation is perpendicular to the field the coil has N =340 turns it has a resistance...

Hi All, I have setup a small experiment with a pulsing coil--Coil 1 to produce a pulsed magnetic flux, say we do not know the specifications of this coil like number of turns on the windings, voltage to the coil, flux density etc. There is another coil --Coil 2 of known specifications...

Hey all, so i have a cylindrical 1.61 tesla magnet with pole orientations (+)_)- being spun at 350RPMs in a cylindrical body of water. The body of water dimensions are 19inches tall, and 13.5 diameter. The magnet is centered in the container of water. Also, the magnet is spinning with a...