What is Electrostatic field: Definition and 70 Discussions
An electric field (sometimes E-field) is the physical field that surrounds electrically-charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field for a system of charged particles. Electric fields originate from electric charges, or from time-varying magnetic fields. Electric fields and magnetic fields are both manifestations of the electromagnetic force, one of the four fundamental forces (or interactions) of nature.
Electric fields are important in many areas of physics, and are exploited practically in electrical technology. In atomic physics and chemistry, for instance, the electric field is the attractive force holding the atomic nucleus and electrons together in atoms. It is also the force responsible for chemical bonding between atoms that result in molecules.
Other applications of electric fields include motion detection via electric field proximity sensing and an increasing number of diagnostic and therapeutic medical uses.
The electric field is defined mathematically as a vector field that associates to each point in space the (electrostatic or Coulomb) force per unit of charge exerted on an infinitesimal positive test charge at rest at that point. The derived SI units for the electric field are volts per meter (V/m), exactly equivalent to newtons per coulomb (N/C).
(Not sure if this should go in SR/GR forum)
I watched a Susskind lecture last week in which he was discussing the fundamental law of charge conservation. He used the example of an electrostatic field surrounding a point charge, and stated that, were we able to suddenly make the charge...
Hello everyone. So that is my question: What does the energy of an electrostatic field mean?
A more detailed description of my background or understanding will help you to provide an answer:
The process to deduce such a thing is usually calculate the work done in order to bring charge...
Hi all
Suppose we have a conducting shell (which is not necessarily a sphere) and no electric charge inside.
Is the electrostatic field inside the conducting shell always zero? (even if there is some charges outside the shell)
What if the shell is grounded?
If the answer is yes, how it...
What comprises the electrostatic field? Electromagnetic radiation is made of photons, but what about the electrostatic field? Two static charges exert forces on one another, through their E-fields, presumably through photon exchanges. I am having trouble forming an idea of what an...
Homework Statement
The space between the two concentric spheres is charged by spatial density of charge \rho=\frac{\alpha}{r^2}. The radius of spheres are R_1,R_2. Integral charge is Q. Find energy of electrostatic field.
Homework Equations
Gauss law
\oint_S\vec{E} \cdot...
Homework Statement
I am trying to solve the electrostatic field (2D) for a microstrip laid on a dielectric with a ground plane on the other side. I am also calculating the capacitance of the microstrip by evaluating a closed surface integral to get the charge on the conductors. I am using FDM...
If I have a picture of the field lines of a field, how do I tell if the field is a possible electrostatic field? What are some things to look for that would imply it either is or is not a possible electric field?
b]1. Homework Statement [/b]
A see-saw with a central pivot is made of insulating material. the left hand side supports a conducting sphere of charge Q= 5.0x 10-6 which experiances an electrostatic force from an idetical sphere 10cm below with +Q
the right end has anouther conducting sphere of...
Homework Statement
Given an electrical dipole of electrical dipole momentum \vec P = p\hat k, centered in 0\hat i + 0\hat j + 0\hat k, find the potential in all the space, where V(\infty ) = 0. If the dipole is now surrounded by a hollow spherical conductor (initially discharged), find the...
Homework Statement
The electrostatic field of a point charge q is E=\frac{q}{4 \pi \epsilon r^3} r. Calculate the divergence of E. What happens at the origin?
Homework Equations
The Attempt at a Solution
Well the solution is: \nabla.E= \partialEx/\partialx +...
Homework Statement
Consider 2 charges with value q=3[\muC], situated on the xOy plane at (0;2) and (0;-2) [cm]. Obtain the coordinates on the x-axis (y=0) where the modulo of the electrostatic field is maximum.
Homework Equations
The Attempt at a Solution
I am trying to do this but...
I have two questions:
Why is it that the field lines of the electrostatic field do stray one from the other one when abs(E) decreases?
Second question:
Why is abs(E) bigger in the areas where the equipotentials are squeezed up?
Thank you!
Homework Statement
Use Gauss' law and symmetry to find electrostatic as a function of position for an infinite plane of charge. Let the charge lie in the yz-plane and denote the charge per unit area by \rho=\alpha*e^{-abs(x/b)}
Homework Equations
Q=triple integral of density
The Attempt at...
Homework Statement
A ping pong ball covered with a conducting graphite coating has a mass .005 kg and a charge -4 microC. What electric field will exactly balance the weight of the ball?
Homework Equations
qE = mg
The Attempt at a Solution
I know how to get the magnitude of the...
Homework Statement
Assuming that an infinitely long line charge of 50(pC/m) parallel to the y-axis at x=2(m) and z=1(m), determine the electric intensity at the point (-1, 5, -3).
The answer given : -0.18(ax0.6 + az0.8)(V/m)Homework Equations
Electric field intensity due to an infinite...
If a charged particle is moving in an electrostatic field is angular momentum conserved? I'm thinking it's only conserved if the electrostatic potential is constant throughout space
Homework Statement
I have a solid, insulating, finite-thickness spherical shell (inner radius a, outer radius b). It's uniformly charged with a total charge of Q. I'm looking for the electric field E, "everywhere in space, including points outside and inside the spherical shell"
Also...
I have about a year of electronics background, but what I'm trying to make is still a bit daunting for me. I want to build a device that creates a very high voltage electrostatic field like a van de graff generator and then input to this field variable frequencies from an electric keyboard...
Hi all,
I am sorry this could sound like heard many times before, but I am trying to understand this problem and found nothing in my physics books.
If I put a small dielectric (bit of paper) into an electrostatic field (for example generated by a rubbed plastic rod), the paper will be...
Doing my physics homework a few weeks ago led me to some startling conclusions (this doesn't really happen often, don't worry too much.) We were learning about electrostatic field energy, and I was doing a problem involving the finding of the electrostatic field energy of a sphere, but later in...