What is Magnetic field intensity: Definition and 20 Discussions
A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. A permanent magnet's magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets. In addition, a magnetic field that varies with location will exert a force on a range of non-magnetic materials by affecting the motion of their outer atomic electrons. Magnetic fields surround magnetized materials, and are created by electric currents such as those used in electromagnets, and by electric fields varying in time. Since both strength and direction of a magnetic field may vary with location, they are described as a map assigning a vector to each point of space or, more precisely—because of the way the magnetic field transforms under mirror reflection—as a field of pseudovectors.
In electromagnetics, the term "magnetic field" is used for two distinct but closely related vector fields denoted by the symbols B and H. In the International System of Units, H, magnetic field strength, is measured in the SI base units of ampere per meter (A/m). B, magnetic flux density, is measured in tesla (in SI base units: kilogram per second2 per ampere), which is equivalent to newton per meter per ampere. H and B differ in how they account for magnetization. In a vacuum, the two fields are related through the vacuum permeability,
B
/
μ
0
=
H
{\displaystyle \mathbf {B} /\mu _{0}=\mathbf {H} }
; but in a magnetized material, the terms differ by the material's magnetization at each point.
Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin. Magnetic fields and electric fields are interrelated and are both components of the electromagnetic force, one of the four fundamental forces of nature.
Magnetic fields are used throughout modern technology, particularly in electrical engineering and electromechanics. Rotating magnetic fields are used in both electric motors and generators. The interaction of magnetic fields in electric devices such as transformers is conceptualized and investigated as magnetic circuits. Magnetic forces give information about the charge carriers in a material through the Hall effect. The Earth produces its own magnetic field, which shields the Earth's ozone layer from the solar wind and is important in navigation using a compass.
Hi!
So my question is this, I have done measurements with an magnetic field meter around a transformer from 0.5 meter away (then measure some points around) and then I moved out 0.5 meters and so on until I reached a nearby building.
So my issue now is I want to visualize this to my customer...
Inner conductor radius = 1cm
outer conductor radius = 10cm
region between conductors has conductivity = 0 & 𝜇r = 100
𝜇r = 1 for inner and outer conductor
Io = 1A(-az)
𝑱(𝑟) = (10^4)(𝑒^-(r/a)^2)(az)
Problem has cylindrical symmetry, use cylindrical coordinate system.
Find the total current...
While going through an article titled "Reflections in Maxwell's treatise" a misunderstanding popped out at page 227 and 228. Consider the following equations ##(23\ a)## and ##(23\ c)## in the article (avoiding the surface integral):
##\displaystyle \psi_m (\mathbf{r})=-\dfrac{1}{4 \pi} \int_V...
Homework Statement
Calculate the time-dependent magnetic field intensity B(t) at an axial distance r from a long, thin straight copper wire that carries a sinusoidal current with an alternating frequency of 50 Hz and a maximum amplitude of 0.5 A.
Homework Equations
I = Asin(\omega t)
B =...
Homework Statement
What is the EMF generated in a straight conductor of length L placed in a time varying magnetic field B as
shown in the below figure..
Homework EquationsThe Attempt at a Solution
Time varying magnetic field is B.cosωt,
EMF = (d/dx)(B.L.cosωt) = -B.L.ω.cosωt
I don't know...
I'm a bit stuck on this question (which is homework so hints are more welcome than outright answers). The question is:
A very long wire carrying a current I is moving with speed v towards a small circular wire loop of radius r. The long wire is in the plane of the loop and is too long to be...
Homework Statement
A square with each side of 5 cm in length.Now if 4 parallel wires in each 4A current is flowing were placed on the vertex of the square.How can I find the center of the square of the magnetic strength?
Homework Equations
I am not sure what equation should be used.If I knew I...
Hi all,
My question is, in electromagnetism, magnetic field intensity H is equivalent to electric field intensity E , right??
Now, definition of E says that E is the force experienced by an unit positive charge in an electric field created by a source charge.
So what is the definition for...
Homework Statement
Two infinitely long filaments are placed parallel to the x-axis as shown in Figure 1.
a)Find H at the origin
b)Find H at (-1,2,2)
Homework Equations
∫Hdl=Ienclosed
H=H1+H2
The Attempt at a Solution
Well following the equation above I get Hl= Ienc then...
Hi everyone here, hope you enjoying this summer ..
i'm taking ' elements of electromagnetic ' course this summer session and i just have a little question here
in the yellow shaded statement
shouldn't it be dl = (l/N) dz instead of dl=(N/l) dz ?
By the way, it's not a HW...
Homework Statement
Let the regions 0 < z < 0.3 m and 0.7 < z < 1.0 m be conducting slabs carrying uniform current densities of 10 A/m^2 in opposite directions. Find H (the magnetic field intensity) and different z positions.
Homework Equations
Biot-Sarvot Law: H = ∫ (I dL X r)/ (4∏R2)...
Is the magnetic field intensity at point P stronger at 2 amps or 4 amps at point P (just outside each electromagnet), if they both have equal amounts of turns of wire.
No relative equations.
I know that magnetic field intensity is stronger as the number of loops are increased but I...
I'm trying to find a mathematical formula between applied tension and resulted magnetic field intensity on an electromagnet.
I know that between the voltage and the electric current there is a pi/2 offset, but in practice there is a bit more than actually pi/2 offset probably something that...
How would I calculate the magnetic flux density of the magnetic field generated by eddy currents induced in a circular plate? I decided it would be reasonable to approximate this by considering the flux density of a current loop. However, it is my understanding that eddy currents are induced...
Now here is a real world practical application.
Australia Post has a warning for shipping magnetic material in the post. Section D2.9.2 states...
Any material that, when packed, has a magnetic flux density of 0.159 A/m or more at a distance of 2.1 meters from any point on the surface on the...
Homework Statement
Given the magnetic field intensity, H, find E.
H=\hat{y}6cos(2z)sin((2x10^7)t - 0.1x)
Homework Equations
\nabla \times E = \frac{- \partial B}{\partial t}
The Attempt at a Solution
Since we have H, we can use the relationship that \muH = B and then take the...
Homework Statement
Positive point charges q_1= 6.90 microC and q_2= 2.90 microC are moving relative to an observer at point P as shown in the figure. The distance from the observer to either charge is originally d = 0.190 m.The two charges are at the locations shown in the figure. Charge...
I tried reading my textbookfor the answers to these questions, but I can't find an answer. Can someone answer these questions?
1. Changing the magnetic field intensity in a closed loop of wires induces
A. Current
B Voltage
C. Both
D. Neither
2. True or False: Energy emitted by...
This is for an assignment that is due next Monday for me. I'm kind of confused here for how to calculate the magnetic field intensity at all points for the conductor(s) in the diagram I have attached. First, there is a cylindrical conductor of radius a, then surrounding it is another conductor...