Questions tagged [electric-fields]
For questions that utilize the concept of electric fields (commonly denoted by the letter E), or for questions whose answers likely involve electric fields. More specific than the [electricity] tag, as questions about the phenomenon & theory of electricity do not necessarily involve the discussion of fields.
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Textbook question on calculation of potential difference between two points
My textbook has the following question
What is the potential difference between two points that are 50cm and 80cm respectively from a point charge of 2uC?
Unfortunately, the textbook has not taught ...
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Electric potential derivation
The definition of electric potential is the work done per unit charge in moving the charge from infinity to that distance.
Now, from Coulomb's law,
$$F = \frac{KQ_1Q_2}{r^2}.$$
So we can now rearrange ...
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What is the net macroscopic electric field at any point inside a dielectric?
This question is based on section 4.2.3 of Introduction to Electrodynamics by David J. Griffiths (Third Edition).
Consider a point $\vec{r}$ inside a dielectric where we are interested in finding the ...
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Application of Gauss Law to Find the Electric Field for an Arbitrary Point in a Ring of Charge in 2D (and Similar Problems) [duplicate]
I checked the website for a similar problem but although there are other questions with a similar title, I couldn't find any question which directly deals with my problem. This question might be ...
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Gauss law and the method of images
Consider a grounded spherical shell conductor (radius $R$) with a point charge $q$ inside a distance $a$ from the center. In order to calculate the electric field inside we can place an image charge ...
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Does cutting out the surfaces with no surface charge affect the charge distribution on the remaining parts of a conducting surface of arbitrary shape?
Assume that we have an arbitrary conducting surface being charged positively/negatively. Also, assume that we have extracted charge distribution by solving the Poisson's equation with proper boundary ...
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Dipoles as vectors
A triatomic molecule $X_2Y$ has plane structure as shown in figure. Due to difference in electronegativity, charge acquired by each X atom is $q$ and charge on Y atom is $- 2q$. The bond length ...
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Moving charge to define magnetic field
Why charged particle has to be in motion to define magnetic field?
Will magnetic force exert any force on a static charge? (as in the static test charge in electric field)
A line from my book reads-
"...
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Trying to understand Paul traps
Paul traps have been confusing me a lot recently. So sorry if there are too many questions
I know that Paul traps confine ions with the help of rapidly switching quadruple electric fields, I've heard ...
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Electric force is zero in a solenoid
This is a question from Young and Freedman's University Physics.
The book's answer says that the electric forces are zero because the wire is electrically neutral, with as much positive charge as ...
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How do I calculate the surface potential of a conductor given a charge distribution?
I have tried the conventional definition but since there is a charge density at the point we want to calculate the potential at, it turns out to be infinity. Now, i dont know how to calculate the sum ...
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Electric field inside a charged hollow sphere
By gauss law we can say that there is no electric field inside the hollow sphere (as $q=0$) , but we say that charges on a charged conductor accumulates in the surface or interface between the metal ...
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$z$-component of electric field due to a static square loop
I am having trouble finding the $z$-component of an electric field discussed in problem 2.4 of Griffith’s introduction to electrodynamics.
Suppose we have a square loop of side length $a$ carrying a ...
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Electric Field Within a Conductor
I was reading Purcell’s text on electrodynamics when I read his argument that in the absence of external forces, there cannot be any electric fields within a conductor for the static situation. My ...
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Using an imaginary conducting shell of infinite radius to calculate capacitance of a spherical conductor
This is a statement from Serway's Modern Physics which I don't understand. It tries to explain capaticance for a single conductor.
Imagine a single spherical charged conductor. The electric field ...
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