Wiley Interdisciplinary Reviews (abbreviated WIREs) is a set of peer-reviewed scientific journals that each publish interdisciplinary review articles on high-profile topics. The series was established in 2009 and is published by Wiley-Blackwell. Each journal publishes new review articles every month.
The journal series won the 2009 R.R. Hawkins Award from the Association of American Publishers.
We connect the charged capacitor to the no-charged capacitor (consider the wires to be ideal R=0), the final energy is less than the initial energy of the system. Where is the lost energy? (see example blew)
(1) https://www.youtube.com/results?search_query=relativity+and+electromagnetism
(2)
If I understand this correctly, then, well, shouldn't all current-carrying wires exhibit a small amount of positive charge?
Hi,
I am not sure if I have calculated the task here correctly:
Based on the drawing, I now assumed that the two resistors are connected in parallel. The total resistance can then be calculated as follows ##\frac{1}{R_T}=\frac{1}{R_1}+\frac{1}{R_2}##.
Since the two wires are made of the same...
There are a couple of problems with the same setup. On plugging in the values and solving for the integral, I am not getting the expected values of the force. Is there something wrong in the solution attached?
I want to make my own multi-wire chamber for school, and I wonder what kind of effect different wires will have on the efficiency. After reading many papers containing research for wire chambers, I saw that all of them did tests with wires made of gold plated tungsten wires with a diameter of...
Suppose there's some slow burning pyrotechnic mixture like KNO##_3## with powdered charcoal, and several really thin threads/wires of magnesium metal (or zirconium or magnesium/aluminum alloy) are made go through a pile of that mixture. Now I would guess that because a mixture of finely powdered...
I understand the iron fillings become little magnets all pointing in the same north south direction similar to the spin aligned electrons in the permanent magnet.
Similarly, a compass near a wire traces out the magnetic field lines ie North/South.
My question is how do I reconcile the fact that...
A standard textbook problem features a constant B field and a conducting loop that increases in area at constant rate.
It is easy to work out the induced EMF and the associated electric field magnitude and direction (CW or CCW). The magnitude of the E field
is E = B v where v is a velocity...
This is related to a question that I asked here: https://physics.stackexchange.com/questions/650709/one-way-magnetic-shielding. Please take a look at the check-marked answer. There is a material that can act as a one-way magnetic/electric shield.
My question is if this material were to be used...
Consider the inertial reference frame in which the positive ions forming the crystal lattice of some portion of a metallic ring are at rest.
In this frame, an inertial force of mra exists. Consider the electrons in this portion of the metallic ring. The inertial force of mra is exerted on the...
Hi all.
This is probably a simple question, but I am hoping for some guidance on why a service would be delivered with 4 wires as seen in the image. It appears fairly common around here (northeast U.S.), if not standard, for one of the phase-conductors to be 'double-tapped' and go underground...
Inserting wires in existing empty conduit
There is an empty PVC conduit size 1.5748" (40mm) in the main entrance panel. It was built around 8 years ago. There is metal wire (see picture above) inside the conduit to pull the main electrical wires from the inside or outside. Is there any...
I have a bit of a mystery with a circa 1905 solenoid and not sure where to turn, hoping someone here might have some insight.
The particulars
Circa 1905 solenoid
(application is an electromagnet in a self-winding clock)
8 layers of windings of 2 different cotton sheathed copper wires
paper in...
There's an isolated capacitor initially carrying nonzero net charge. Then place the capacitor in a circuit connected with ideal wires (no resistance). Where will the excess charge go? Can they stay in wires or on any surfaces of conductors in the circuit? Electric field needs to be 0 everywhere...
Hi, this is my VERY FIRST post so if I've made a bundle of noob mistakes accept my pre-emptive mea culpa. I did read and like the rules.
I have seen some stories in Phys.org about nano wires and I immediately thought of the nano wires in Larry Niven Known Space milieu which can cut right through...
Homework Statement:: I am studying on my own, so I don't have a specific homework statement, but want to make sure I am thinking about things correctly.
What I am wondering is if you have equivalent wires, let's say both are made of copper, and one wire has three times the voltage of the...
For the first part, since
$$ E(r) \propto \frac{1}{r} \hat{r}$$
by the principle of superposition the maximal electric field should be halfway in between the two wires.
Then I'm not sure how to go about the second part of the question. I understand that the total potential due to the two wires...
Why do the magnetic fields in-between the wires does not seem to cancel? Even those outside each wire? (the fields do are not in opposite direction). Yet most of the people I have talked to until now says that such magnetic fields do cancel? I am confused...
The correct answer is the second one. I honestly have no idea why this is so. I understand that the right rope has less tension that the left one since it's at a shallower angle from real world experience, but I don't really know why this is so, let alone how the forces compare to gravitational...
A common thrope in SF (Endymion, Battle Angel Alita, even Three Body problem mentioned it), something that is so sharp that it can easily cut through tank armor. Could it possibly work in reality without some sort of stabile superheavy element?
please correct me if I'm wrong.
is it for the question b, F/l= 0.50 right? does that mean the resultant magnetic force at X is determine by the force at Y and Z? do I need to consider the direction to solve the equation? first step to know the direction of each conductors I use the right hand...
μThe magnetic field is supposed to be B=μ0i/(2πr). I think that the force would be aimed upwards.
Now I tried to divide the wire BC to infinite smaller wires where B is roughly constant in each one of them.
What I get is:
However this is not correct when I plug the relevant numbers in it...
From what I understand, the force between two current-carrying wires can be calculated as:
$$\dfrac {F}{L}=\dfrac {\mu _{0}I_{1}I_{2}}{2\pi R} $$
Doesn't this mean:
$$\dfrac {F}{L}=\dfrac {\mu _{0}I_{1}I_{2}}{2\pi 1^{2}}=\dfrac {1}{2}kx^{2} $$ ?
$$\dfrac {\left( 4\pi \times 10^{-7}\right)...
OK so a wire with a current creates a b field in accordance with the right hand rule. Now moving charge will feel a force (if its moving in the correct direction) while stationary charges will not feel a magnetic force.
What I am curious about is if we move the wire itself, will a stationary...
Homework Statement: The distance between two parallel long wires, carrying currents equal to i and 3i respectively, is d as shown in the picture. What is the distance from the wire carrying the current i at which the magnetic field is zero
Homework Equations: guess biot-savarat
Being two...
This is a servo, there is some sort of a hard white paste keep the 3 wires from moving around and accidentally touching each other. It appears to melt with heat. Does anyone know what it is? My guess is putty.
Thanks in advance
I've had a lot of problems that involve a segment of current carrying wire, for example when you have a square loop of wire.
I have a formula for "long" wires that is B = μ0 * I/(2 * π * d).
Can I use this for shorter wire segments, and if not, what formula can I use?
I have a question for my E&M assignment (I'm not putting it in the homework thread since I just need more of a concept check) that involves a straight wire with current through it. If you have a wire with a current through it, and you have a rectangular wire also with current, to the right of...
Hi!
I have wires that have printed 600V 16 AWG on it. I found this table: http://www.basicsofelectricalengineering.com/2017/07/basics-of-wire-gauge-and-awg-system.html . As I understood then long wires can be used to transmit 3.7 amps and short ones 22 amps? Also does it depend on voltages...
Homework Statement
In a given square ABCD each side is of 1 m and resistance of wire is 1 ohm/m. A resistance of 1 m is connected from A to E (which lies on side CD). A constant potential difference is applied across A and C, if potentials of B and E are same then find CE/ED.
Homework...
Suppose a straight current carrying wire is immersed in a uniform electric field along its axis. For this problem, please don't worry about complete loops or return paths, just consider a segment of straight wire carrying a current. Since external electric fields don't get inside conductors due...
Homework Statement
A) Three infinite, current-carrying wires are arranged as shown below. In terms of the given quantities, determine the magnitude and direction of the magnetic force per length acting upon wire 2. (Part A.jpg attached)
B) Three infinite, current-carrying wires are arranged as...
This is a 12-0-12 transformer that I intend to use in my circuit:
Why are there three wires in the secondary? One is of course the neutral (in black). Why are there two live wires?
As an additional question, can I use four 1N5408 rectifier diodes to convert the output of this transformer to...
Okay this may seem like a basic question. I was wondering what would be the best way to connect 8 wires to a single wire. Here's a simple diagram that shows what I'm trying to do:
I've been looking around and I've found things like this:
Although it seems that there is no larger one that can...
Can someone please help with this thought experiment? I have sought advice elsewhere but it remains unclear to me.
I have a straight piece of two conductor "figure eight" wire (like speaker wire or US power cord) laid out left to right.
I connect the output from a push-pull type audio...
Homework Statement
3 - 2 , 1 km wires ( so acting like infinite wires ) , both have same current , no direction specified , , separated by 1 meter distance and having between them a magnetic force of module 0.02 N .
find the current i=
Homework Equationsthe definition of 1 ampere has same...
Homework Statement
Two long, parallel copper wires of diameter 2.5 mm carry currents of 10 A in opposite directions. Assuming that their central axes are 20 mm apart, calculate the magnetic flux per meter of wire that exists between those axes. What fraction of this flux lies inside the...
Homework Statement
each wire carrying 10 Amps
a = 0.3 meter
point o located in the center
Homework Equations
B = permeability constant * I / ( 2 ##\pi## r)
r = distance between O and the wire
r perpendicular to B and I
A = carrying current into the page
B and C = out of the pages
The...
Homework Statement
Homework Equations
J = nqvd
J = I/A
Q = It
The Attempt at a Solution
Basically we check whether the variable that we are looking at is proportional or inversely proportional. However, at what part do we stop? Where is it okay to substitute say Q = It and where is it not...
Homework Statement
Two parallel wires have currents that have the same direction, but differing magnitude. The current in wire A is I, and the current in wire B is 2I. Which one of the following statements concerning the situation is true?
A) Both wires attract each other with the same force...
Homework Statement
A resistance thermometer bridge circuit shown below has a
designed maximum temperature of 150°C, ignoring the effects of
connecting wire resistance. If the connecting loop is 200 m
determine the smallest gauge (swg) of copper wire which must be
used if the indicated maximum...
Homework Statement
In the picture at points A and B are two thin parallel wires, where traveling currents are 15 A and 32 A to opposite directions. The distance between wires is 5.3 cm. Point's P distances from A and B are the same. Calculate the magnetic flux density at point P.
Homework...
Ok so I haven't been on here for a while but I can't seem to find an answer to my question anywhere and really need some help!
So I not only am an electronics hobbies but I have fun installing car audio systems as well. The problem I am running into is that I would like to run an alt wire...
Homework Statement
In an electric circuit, consisting of copper wires with cross section area of Sc=5mm2 and a temperature of t=25C, a lead fuse is added melting when the copper wire temperature increases by Δt=25C. Find the cross section area of the lead fuse wire Sl=x.
specific heat...
I have this simple circuit
I know that if a consider the wire from the + of the battery until the + extreme of the resistor, in this portion the wire has the same potential. The same thing regarding the portion of the wire beetween the - of the battery until the - of the resistor.
If this...
Homework Statement
Homework EquationsThe Attempt at a SolutionMagnetic field due to both semi - infinite straight wires on P = Magnetic field due to infinite straight wire on P = ## \frac { \mu_0 I } { 2 \pi a } = 2 * 10 ^{-5} ~wb/m^2 ##
Magnetic field due to semi – circular wire on...
I have a silly question.
In a simple electrical circuit, we know that the two ends of the wire are connected to different potentials of a battery through the load. Potential difference causes the current flow.
But how the wire comes to know that the other end of it, is connected to different...