What is Eletric field: Definition and 22 Discussions
Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations. Various common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others.
The presence of an electric charge, which can be either positive or negative, produces an electric field. The movement of electric charges is an electric current and produces a magnetic field.
When a charge is placed in a location with a non-zero electric field, a force will act on it. The magnitude of this force is given by Coulomb's law. If the charge moves, the electric field would be doing work on the electric charge. Thus we can speak of electric potential at a certain point in space, which is equal to the work done by an external agent in carrying a unit of positive charge from an arbitrarily chosen reference point to that point without any acceleration and is typically measured in volts.
Electricity is at the heart of many modern technologies, being used for:
Electric power where electric current is used to energise equipment;
Electronics which deals with electrical circuits that involve active electrical components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive interconnection technologies.Electrical phenomena have been studied since antiquity, though progress in theoretical understanding remained slow until the seventeenth and eighteenth centuries. The theory of electromagnetism was developed in the 19th century, and by the end of that century electricity was being put to industrial and residential use by electrical engineers. The rapid expansion in electrical technology at this time transformed industry and society, becoming a driving force for the Second Industrial Revolution. Electricity's extraordinary versatility means it can be put to an almost limitless set of applications which include transport, heating, lighting, communications, and computation. Electrical power is now the backbone of modern industrial society.
This is the outline of the exercise I did on paper.
So basically, my attempt to solve this involved writing the equations according to the reference frame I chose. The origin is the first charge.
I began by putting the equations on paper:
E = 0=> k*q*1/(x^2)+k*q*1/((x+d))^2 = 0, Note that 'x...
Homework Statement
An infinite metal plate has a surface density of charge σL=-6μC/m² , Left side and a surface density Of load σR=+4μC/m² , in the right side. A Gaussian surface In the form of a circular cylinder, with area A 12 cm², is Located with the left side inside the plaque and a thin...
Homework Statement
Two +3.0nC charges are shown in the diagram below which are spaced 10cm apart. What are the strength and direction of the electric field at the position indicated by the dot in the figure (Figure 1) ?
What is the electric field in N/C?
What is the direction of the electric...
1) Imagine you have a clock but in each number you have a charge "q". If I have a test charge Q at the center, then by simetry, the net force on Q is zero. I imagined like, 1 cancels 7, 2 cancels 8, etc...
But then, if I have a polygon with 13 sides, with a test charge Q, the net force also...
Homework Statement
Hi guys. Just wondering if anyone could help me with Q7 part a) on the pdf I have attached below. I think my working are not correct but I can't see other way. If I add 6. and 7. together I would get an ans in terms of what the question is asking but I am not sure if that is...
Millikan Oil drop experiment.
For my current lab, we are recreating the milian oil drop experiment to measure the charge of an electron. However, we are using 1-micron diameter latex spheres in place of oil drops.
Problem:
I am having difficulty deriving an equation for the speed of the drop...
Please explain how or why (I have zero knowledge in physics)..
1. is Voltage the energy required by the elctrostatic forces between 2 points to move a certain quantity of charge between them?
2. Why is it called potential difference? Does this have to do with the difference in potential energy...
Homework Statement
A Ring with center in (0,0) and R radius.
The charge distribution from the ring is: ψ(θ) = ψo*Sin(θ), where θ is the angle from the x-axis (counterclowise).
Negative values of the sine determine negative charge, and 0 no charge at all.
What is the field (E) created from this...
Sorry about my english , I'm still learning.
I did it by energy, but i want to solve by integration
QUESTION : A charged and massive particle runs with 66 m/s, 3^10-6 coulomb and 6^10-3 Kg towards a fixed particle with 4,5^10-6 coulomb, separated by 4,3 meters . What's the distance between...
Homework Statement
I don't have any statement, i have to find the problem statement from the answers
a) E = Q / [ Eo* (0.020 m)^2 ]
b) a = E (1.60*10-19 C)/(1.67*10^-27 kg) = 2.0 *10^12 m/s^2
R=0,020 m
q=1.60*10-19 C
m=1.67*10^-27 kg
Homework Equations
F=ma => a=qE/m
Gauss Law Integral of...
Hi
one quick question about the electric field of a conducting sheet of charges.
When you given a horizontal sheet of conductor with uniform distributed charge on its surface,will there be any electric field on the top AND on the bottom of the sheet?
How is that different from a...
Hi! I have already write everything on the pictures(In attachment), I have already circled the correct answer, however, I am not sure explain it correctly. So, can you check my explanation or question?
Thanks!
Hi! I have already write everything on the pictures(In attachment), I have already circled the correct answer, however, I am not sure explain it correctly. So, can you check my explanation or question?
Thanks!
Hi! I have already write everything on the pictures(In attachment), I have already circled the correct answer, however, I am not sure explain it correctly. So, can you check my explanation or question?
Thanks!
Homework Statement
Question 2.2
http://www.studyjapan.go.jp/en/toj/pdf/08-007.pdf
The picture is in the next page of the problem.
k is the Coulomb constant.
q+ is the charge at point A.
q- is the charge at point B.
AC = BC = CD = a
Homework Equations
E = kq/d²
a² = b² + c²...
Suppose I have a large wall of neutral pi mesons, a lot of particles in a plane . And they decay into electron positron pairs and move in opposite directions to conserve momentum.
Now we have created an E field in between the particles going from plus to minus. Now we have a parallel plate...
electric field does not exist in conductors because it gets nullified due to polarization of conductor,but in current electricity the electric field is established in a circuit(conductor) which gives drift velocity to electrons for charge flow.how can electric field exist in a circuit?
please...
Homework Statement
"A rod of 13.1 cm long is uniformly charged and has a total charge of -23.2 micro coulombs. Determine the magnitude of the electric field along the axis of the rod at a point 52.1575 cm from the center of the rod. The Coulomb constant is 8.98755e9 N M^2/C^2. Answer in units...
Homework Statement
Considering a cylinder of radius, R, and length D with uniform charge density p containing a spherical cavity of radius R/2. Find the field in the cavity.
The cavity sits on one side of the cylinder so that it's diameter spans from the concave face of the cylinder to the...
I was told that at electrostatic equilibrium, the electric field inside a conductor will be ZERO, so that the charges will not move any more.
but why, I argue that, even when the electric field is not zero everywhere inside the conductor, there is still a chance for the charges to be...
I'm looking for some software that will allow me look at equipotential electric field lines for various structures in two dimensions. Any thoughts?
I remember I ran into a good looking utility when I was researching antenna design, but now I can't find it...