Questions tagged [charge]
A fundamental property of matter which causes it to experience electromagnetic forces.
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Strange material, Bydrogen
Let's take a hypothetical scenario in which you manage to make a meta material in which the bulk of the mass is made of by a central negative nucleus and that has a single spin 1 boson whizzing around ...
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1answer
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Does the electric field of a charged particle really contribute to its mass? [duplicate]
An electron at rest creates a static distribution of an electric field around it. Wherever the particle moves, it carries or drags the field with itself. Does this electric field contribute to the ...
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1answer
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Fractional electric charges
Since the Oil droplet experiment we are talking about elementary electric charges:
Charge quantization is the principle that the charge of any object is an integer multiple of the elementary charge....
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1answer
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How does change in magnitude of a point charge reflect change in its electric field at a particular point in space with respect to time?
We know that electric charge of an object results in an electric field formed around it. We also know that varying the magnitude of a point charge does not instantly produce a change in the electric ...
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1answer
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$E$-field of a uniform distribution of charge at 3D point [on hold]
How can I find Electric field of a uniform distribution of charge at 3D point?
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1answer
34 views
Tangential component of electrostatic field on a charged surface?
This is a question from class 12 Physics NCERT Part I:
Show that the tangential component of electrostatic field is continuous from one side of a charged surface to another. [Hint: Use the fact ...
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1answer
44 views
What exactly happens when a charged conductor comes into contact with an electric insulator?
Let us say we have a negatively charged conducting sphere:
If we put an insulator into contact with the sphere:
Would the negative charges located in the contact region transfer from the surface of ...
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1answer
45 views
Why is the electric field of a conducting sheet of charge double the electric field of just a sheet of charge?
I was reading Feynman's Lecture on the Application of Gauss' Law and I came across this:
Source
This really confused me. What are the "other" charges he talks about? How does the additional field ...
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3answers
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Why don't capacitors hold charges on the outer walls of the plates? [on hold]
Suppose I have two metal plates in a vacuum and I give this system some electric charge,the charge would distribute itself according to Gauss law on both the inner and outer walls of both plates...but ...
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1answer
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How does induction work when a body is charged (ie) not neutral?
I know that for a neutral body, if a point charge is placed next to it, induction works something like this:
Consider a uniformly charged conducting body with charge Q on it. We place a positive ...
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3answers
345 views
What happens when electrons reach the battery?
We have a capacitor which is connected to a voltage source. The top plate of the capacitor is connected to the positive terminal of the source. Therefore, electrons go from the top plate to the ...
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2answers
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Regarding charge densities and the amount of charge located on a point for continuous charge distributions
Suppose we have a volume $V$ containing a charge distribution defined by $\rho (\textbf{x})$.
The amount of charge $q~(P)$ located at an arbitrary point $P(x_{0},y_{0},z_{0})$ is :
$$q(P)=\int_{x_{0}...
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1answer
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How can we find the charge distribution of $n$ external electrons on the surface of a conducting cube? [closed]
Suppose we take 'n' electrons and put them on the surface of a conducting cube.
How can we calculate the charge distrubution and position of these electrons once the static situation has been arrived ...
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1answer
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Inconsistency regarding two charge elements on a uniformly charged disk
Let us say we have the following uniformly and positively charged thin disk:
Suppose also that the total charge on the disk equas $Q$, with which we could define a constant charge density $\sigma$ ...
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1answer
51 views
Coulomb's law and the continuous charge model in an infinite charged plane [duplicate]
The $E$-field of an infinite plane with a uniform charge density $\sigma$ has a constant magnitude equaling $2\pi\sigma$.
Now, this magnitude assumes a continuous charge model throughout the plane.
...
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1answer
45 views
Work done by charged particles [closed]
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, ...
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1answer
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Is there an easy way to tell whether this “Curlmeter” would rotate or not?
Let us say we have the following symmetrical apparatus:
Four equal positive charges, all connected to a shaft that can rotate, the connecting rods are insulated, and so does the shaft.
Now ...
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2answers
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Null electric field at infinity? How? [closed]
Suppose there are two charges (4uC each) fixed in the horizontal axis. One is in x=0 and the other in x=8m.
I've obtained the electric field:
$E=-k\cdot4\mu C \cdot [\frac{1}{x^2}+\frac{1}{(x-8m)^2}]...
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1answer
51 views
Infinite parallel plates have the same electric field between no matter the distance?
I saw this in a lecture about gausses law in application to infinite charged planes:
How is it possible that the electric field above the top plane and below the bottom plane is always zero, given ...
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4answers
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Is charge point-like or a smear?
Coulomb gave the law for the force between two static charges while considering them to be points in space. But the differential form of Gauss' Law talks about charge densities, a thing possible only ...
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2answers
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Confusion when applying Gauss's Law to a charged sphere
We have a charged sphere with charge Q and the charge is uniformly distributed with a charge density ρ. The sphere has a radius R.
If we construct a Gaussian Surface with radius r, with r < R. If ...
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1answer
20 views
Electrical energy of a charge distribution and the work required to assemble it
The electrical energy of a charge distribution is equal to the integral of $\,E^{2}dv/8\pi$ over all space, and if I have a charge distribution of finite extent, then the energy is finite.
Moreover, $...
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1answer
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Path independence of the line integral of the electrostatic field created by an arbitrary charge distribution
Suppose we have the following situation:
A positive arbitrarily shaped charge distribution.
The line integral of the total electric field, generated by the whole distribution, from $A$ to $B$ is ...
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2answers
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What is actually being removed when a metal conductor is grounded?
I found this image earlier this morning, and yes, there are a lot of diagrams/illustrations about this, transferring charges by induction has been introduced since the very beginning of high school ...
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1answer
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Why did the experimenter touch the circular plate in this demonstration?
In this introductory physics experiment demonstration, the experimenter went through the following procedure:
First, he charged the rectangular plate by rubbing it with fur.
Next, he laid a ...
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0answers
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Condemnable limit for the electrostatic field? [on hold]
When we define the electrostatic field (law's Coulomb), generated by a $Q$ charge calculated in a point $P$ of the space, we place a particle with a small positive charge $q_0$, called a test charge ...
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4answers
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Electric field of point charge
in above picture, we have two point charge ( same size ).
Does electric field of q2 at location of q1 depend on size of q1?
because we know when we want to measure electric field of a charge, use ...
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0answers
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Electrostatic force between charges placed in 2 different mediums [duplicate]
Here is the problem.
Question: What is the force between the 2 charges?
So, If I convert medium 1 into medium 2 keeping the force constant then, (considering an imaginary charge q where the 2 ...
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1answer
70 views
How come subatomic particles interact with each other while not being in contact? [closed]
Although electrons stays away from protons an atom remains electrically neutral
But two atoms one positively charged and another negatively charged remain so until they comes in contact.
Can the ...
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1answer
60 views
Electric field of Charge
in above picture,we have a fixed positive charge.
this positive charge create electric field in its surrounding.
we consider a special point in left of positive charge.
Is electric field different ...
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1answer
9 views
Charge on an electrical conductor
Consider we have very precise equipment (s) needed for this question. There's a finitely big uncharged conducting sphere. Suppose we had an extra electron from an external source and we plan to keep ...
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1answer
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Electric potential difference between capacitor's plates, doubt about the sign?
I'm trying to solve a doubt that has taken me away way too much time and so I'm asking here. In our lectures we defined the electric potential difference between a point A and B as the line integral ...
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1answer
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Cylindrical capacitor, why is the electric field radial between the two plates?
I'm trying to understand why if I consider a cylindrical capacitor whose height is $h$, the radii are $R_1$ (external) and $R_1$ (internal) and I put myself between the two plates I can say that the ...
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2answers
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How does magnetic field know the particle's velocity? [closed]
The force on one charged particle due to a uniform magnetic field is $F=qvB\sin\theta$. According to this formula, the faster the particle's velocity, the greater the force of the magnetic field is ...
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3answers
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Electric Field vs Distance (Contradiction)
There was a text book question in my physics class this morning on what happens to the strength of an electric field $E$, if its distance between two plates decreases by 2 fold.
My initial thought ...
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0answers
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Infinite charge distribution [duplicate]
I've been thinking about a distribution of charge that does not follow Maxwell's euations, and I can't understand what's wrong with my reasoning. If we have a constant distribution of charge $\rho(x,y,...
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1answer
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Charge in a conductor
How to measure net charge flowing through a current-carrying conductor or a wire without actually measuring the current?
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4answers
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How to experimentally measure the number of electrons flowing through a current-carrying conductor without using any other physical quantity? [on hold]
How to experimentally find the number of electrons flowing past a given point during a given time interval without involving any other physical quantity?
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1answer
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Conflicting models about how energy transferred in an electric circuit [duplicate]
I've been studying DC circuits recently, but I've run into some confusion concerning how batteries deliver energy to circuit elements.
From what I've read online, it seems that energy in circuits ...
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2answers
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Common potential in Capacitors
If two isolated charged capacitors (of different capacitance) are connected in parallel to each other they acquire a common potential. But suppose if i connect positive plate of one capacitor to ...
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3answers
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Charging electroscope
In above picture. When near positive rod to the electroscope, electrons go to top of electroscope. then connect electroscope to ground. Why electrons go from ground to electroscope? in top of ...
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Would fast oscillating charged object emit light?
If I were able to mechanically oscillate an electrically charged object at frequencies of 430-580 THz, would the object emit light?
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2answers
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Charging sphere with induction
In the above picture, when we connect the positive side or negative side of the sphere to ground, electrons go to ground.
Why isn't there any difference between the situations when the negative side ...
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5answers
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How can the electric potential be zero at a point where the electric field isn't, if that field can give a test charge kinetic energy?
Say we have 2 charges set up like above. Why is $V_3=0$ ?
I can understand mathematically that the scalars fields cancel out, but I don't understand it physically. If I place a positive charge in ...
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0answers
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Are there compelling reasons not to organize the elementary particles by charge and spin? [closed]
I don't like the way the standard model is currently displayed (see second picture for reference).
It does a poor job of abstracting the information into something understandable. As far as I ...
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1answer
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Effect of a current carrying wire on a point charge
Given a point charge $q$ near a wire carrying current as shown, what would be the effect of the magnetic field produced by the wire on this point charge $q$? I think the sign on $q$ is important so ...
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1answer
70 views
Why do bound charges not appear in boundary conditions on a surface between two dielectrics?
I'm studying electromagnetism, more specifically dielectrics. However, the concepts of bound charge and free charge have been somewhat confusing for me yet. The Griffiths' book deduces one of the ...
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1answer
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Charge in the middle of a flat dielectric
We know that due to external uniform fields, the dielectric atoms get polarized in the direction of the field, but what if the charge is inside the dielectric, the electric field of the charge is ...
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1answer
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Does a metal with a strong positive charge decrease its strength?
Does a metal with a strong positive charge decrease its strength? According to the mainstream theory of metal bonds, free electrons form a link between lattices. If this is the case, the removal of ...
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1answer
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Electric field in a circuit
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 ...
