Magnetic flux Definition and 353 Threads

"The number of magnetic lines of force passing through any area in a magnetic is known as magnetic flux" So the definition of flux goes. But I find it rather ambiguous and loose. Or is that I am missing some vital point? The magnetic lines of force are not real, they are imaginary lines...

The output voltage of a 74 W transformer is 13 V, and the input current is 34 A. By what factor is the voltage multiplied? V_{s} ------=? V_{P} Honestly I am not sure exactly where to start in solving this problem.

Homework Statement A long straight wire on the z-axis carries a current of 3.0 A in the positive direction. A circular loop in the xy-plane, of radius 10 cm, carries a 5.0-A current, as shown. Point P, at the center of the loop, is 25 cm from the z-axis. A circular coil of four turns, 2 cm...

Homework Statement You hold a wire coil perpendicular to a magnetic field B. If the magnitude of B increases while its direction remains unchanged, how will the magnetic flux through the coil change? Check all that apply: The flux is unchanged because the position of the coil with...

Magnetic flux...PLEASE HELP! Homework Statement A 13.5 cm × 13.5 cm square bent at a angle 90°. A uniform 0.463 T magnetic field points downward at θ=33° angle. What is the magnetic flux through the loop? (a=6.75 cm, b=13.5 cm, c=6.75 cm.) Homework Equations The Attempt at a...

Magnetic flux...help please! Homework Statement A 2.02-cm-diameter solenoid passes through the center of a 8.62-cm-diameter loop. The magnetic field inside the solenoid is 0.75 T. A.) What is the magnetic flux through the loop when it is perpendicular to the solenoid? B.) What is the...

Simple Magnetic Flux Prob... Homework Statement What is the magnitude of magnetic flux through the loop? (a=22 cm, b=27 cm, B1=1.2 T, B2=1.7 T.) Homework Equations MF = AB cos theta The Attempt at a Solution MF = AB So wouldn't I just do ((0.2m * 0.2m) * 1.2) + ((0.22m *...

Homework Statement A loop of a wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.24 m. The normal to the plane of the loop is parallel to a constant magnetic field ( = 0°) of magnitude 0.75 T. What is the change in the magnetic...

What is the definition of Magnetic Flux? My textbook tells me that it may be 'visualised as the total number of magnetic field lines rather tan their concentration... be aware that this is NOT a definition.' thank you

Homework Statement A coaxial conductor has the length L. The inner conductor of radius a carries a current I in the z direction. The outer conductor is very thin and has the radius b. Calculate the total magnetic flux enclosed within the conductors. Homework Equations Magnetic flux...

magnetic flux density is denoted by the B symbol magnetic flux is denoted by the \phi symbol so why do people use B as if they were referencing to magnetic flux? "magnetic flux density is a measurable quantity indicating the strength of a field" ...this was stated by a teacher of...

Why a magnetic flux in closed surface area is always 0?

What is change in the magnetic flux (delta B)? Like on this http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/emfchb.html"

So what produces a solenoid's magnetic field? Voltage or Power? Voltage = Current * Resistance Power = Current^2 * Resistance Magnetic field magnitude of a solenoid = magnetic constant * turns * current We can quadruple the turns using the four times of the same type of wire, but that will...

[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...

I read somewhere that increasing the current flowing through a solenoid will increase the magnetic flux density but cannot increase the magnetic flux. From what I gather magnetic flux is the space the magnetic field covers or the range of the magnetic flux lines and flux density is how many...

Is the incoming flux (first peak) equal in magnitude to the outgoing (second peak) flux? Why? A magnet was dropped through a solenoid, this experiment was completed twice, a graph of Voltage (V) vs. Time (t) was made for each experiment. The area under each curve is defined to be equivalent to...

Homework Statement A long straight wire carries a current 36 A. A rectangular loop with two sides parallel to the straight wire has sides 7.5 cm and 15 cm with its near side a distance 3 cm from the straight wire as shown in the figure. The permeability of free space is 4π e -7 T*m/A. Find...

Hi All, Can anyone help with the following problem (see attached image)? The left diagram shows a magnet clamped to a piece of steel (in the example the steel is the wall of a pipeline). The lines of flux are shown to pass through the pipe wall. I am happy with this diagram and what it shows...

I was reading there that if you wind a piece of metal wire into a coil it creates a magnetic field. Does this wire have to have current running through it? I know that a changing electric current creates a magnetic field but how does winding a piece of metal wire into a coil create magnetic flux?

Hi. I am having a little trouble grasping the concept of a magnetic field. My book doesn't explain it very well. I understand that any magnet has a magnetic field, which is the space around it in which other magnets are subject to a force due to the magnet. What I am having trouble with...

a) There is an infinitely long wire carrying a current I. There is a square loop with resistance R a distance a from the wire in the same plane. Find the total magnetic flux through the loop. b) There is an infinitely long wire carrying a current I in the z-direction. There is a square...

Hi, This problem confused me the first time around, but I think I've got it. I just want a confirmation that my reasoning is correct. I know I have the correct answer, but what is important is the method of arriving at it. Homework Statement A wire is being wound around a rotating wooden...

I need help solving this question: The magnetic flux through a metal ring varies with time t according to B = 3( at 3 - bt 2) Tm2, with a = 2.00 s-3 and b = 6.00 s-2. The resistance of the ring is 3.20 . Determine the current induced in the ring at t = 1.00 s. I know that you have to take...

Homework Statement A long, straight wire carrying a current of 4.00 A is placed along the axis of a cylinder of radius 0.500 m and a length of 3.00 m. Determine the total magnetic flux through the cylinder. Homework Equations Flux = BA B(long wire) = (((4 * pi) * 10^-7) * I )/ (2 * pi * R)...

(N.B. All the following assumes that the magnetic fields are in vacuo). I'm having trouble deciding what flux linkage is (as in Faraday's law etc.). What is the proper definition? My textbook gives the example of a coil moving through a magnetic field, tracing out a cylinder - the flux...

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...

Homework Statement Griffiths Problem 7.8 A square loop of wire (side a) lies on a table dsiantce s from a very long straight wire, which carries a current I, as shown in teh figure. Find the flux of B through the loop Homework Equations Flux of B is given by \Phi_{B} = \int \vec{B}...

hiya If 'b' is the length of a wire, and 'I' current running trough it, then if put a wire inside magnetic field ( not perpendicullary and also not parallel to magnetic field lines, but some angle in between the two ), then magnetic force on a wire will be: F = I * b * B * sin[angle] where...

In a physics laboratory experiment, a coil with 210 turns enclosing an area of 12.7 cm^2 is rotated during the time interval 3.70 \cdot 10^{−2} sfrom a position in which its plane is perpendicular to Earth's magnetic field to one in which its plane is parallel to the field. The magnitude of...

Along a wire (of radius r) a current i is crossed from one. Calculate the magnetic flux through the surface S, inner to the wire. http://img138.imageshack.us/my.php?image=cilindrodb4.jpg I think \phi_b= \int B dS= BS B=\mu_0 i/2\pi r How to calculate S if I have not the length of wire...

Hi everyone, Apologise for so many questions within a short period of time. I'm in the midst of my holidays and I can't clarify my doubts in school. For a particular A.C generator, it has a large rotating rectanglar coil rotating at 50 rev per second in a B field strength of 0.29T. It has...

A rectangular loop of wire 24 cm by 72 cm is bent into an L shape, as shown in Figure 23-37. The magnetic field in the vicinity of the loop has a magnitude of 0.034 T and points in a direction = 22° below the y axis. The mangnetic field has no x component. Find the magnitude of the magnetic...

I have a question dealing with magnetic flux that I cannot seem to get. Please help Question= A 2m conductor is formed into a square and placed in the xy plane. a magnetic field is oriented 30 degrees above the horizontal with a strength of 6T. What is the magnetic flux through the...

I started reading Lectures on Electrical Engineering Vol I, Steinmetz. I thought I should be able to understand most of it, but I don't get the first page! It says that: 'The total number of lines of force issuing from a magnet pole is called its magnetic flux. The magnetic flux, phi, of a...

This question might seem rather naive. We define the magentic flux through a loop by \Phi = \int \vec B \cdot d\vec a. But an infinite number of different surfaces can be fitted to a given boundary line...so how is the flux independent of the nature of the surface used?

These Q's are probably simple for those of you who have/completed a course in Vector Calculus. But I'm only a higschool/secondaryschool student, so I haven't. 1. I'm not sure how the infinitisemal magnetic flux density d\textbf{B} from a wire element d\textbf{l} with a current I, which is...

Hey everyone, I have failed to show that the magnetic flux outside a cylindrical conductor is zero. The problem goes like this: a coaxial cable consists of a solid inner cylindrical conductor of radius a and an outer cylindrical conductor of inner and outer radius b and c. Distributed...

I am really really hoping that the answer is wrong in the back of my book otherwise my entire basis for electricity/magnetism will be shattered :cry: Basically, there is a picture of a magnetic field going into the page, and there is a coiled loop within this magnetic field. If the...

Hello Group Members :smile: I was needing some candid explanation or guidance on what are similarities and differences between magnetic flux and electric flux. One thing I know of is that magnetic flux acts on ferromagnetic material whereas Electric flux acts on any oppositely charged...

After everyone in our class got less than 50% on our first physics test this term, (AC, magnetic flux, frequency/oscillations), our teacher decided to give us a retest. Though, he hasn't gone over anything else, so i thought i'd ask a couple questions here. 1. I was taught that Inductive...

I'm planning an investigation on how magnetic flux density midway between opposite poles of 2 bar magnets varies with separation of the bar magnets (using a Hall Probe). [simply as shown in attachment] To do this, I'll need to calibrate a hall probe (which I think is done by working out the...

Here is the problem A long and narrow rectangular loop of wire is moving toward the bottom of the page with a speed of 0.020m/s (see the drawing). The loop is leaving a region in which a 2.4-T magnetic field exists; the magnetic field outside this region is zero. During a time of 2.0s, what...

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 =...

Find the magnetic flux crossing the portion of the plane theta = x/4 defined by 0.01 m < r <0.05 m and 0 m < z < 2 m. A current of 2.50 A is flowing along z-axis along a very long wire. in drawing the picture i know that there is a long thin wire with a current of 2.5 amps flowing...

Find the magnetic flux crossing the portion of the plane theta = x/4 defined by 0.01 m < r <0.05 m and 0 m < z < 2 m. A current of 2.50 A is flowing along z-axis along a very long wire. in drawing the picture i know that there is a long thin wire with a current of 2.5 amps flowing...

A uniform magnetic field of 0.0300T points vertically upward. Find the magnitude of the magnetic flux through each of the 5 sides of the open topped rectangular box, given the dimensions of the box are, length = 0.335m width = 0.12m, and Height = .10m. Find Wb through long side, short side...

Why is it that a changing magnetic flux through a surface should induce an emf? I know that the emf is from a non-conservative electric field, but how exactly was this field generated? (if that is the correct expression for it)

My physics teacher today taught my class the formula with magnetic flux density... Force on a wire in a magnetic field F = BILsin(theta) the part i am enquiring about is the B in which he explained to be B is the magnetic field strength (measured in Tesla's) He also said 1T =...