All Questions
95 questions
1vote
1answer
82views
Conceptual issue with how energy/energy density relates to the electromagnetic fields
this is a question that I've been thinking about for some time, and was wondering if anyone can shed light on it? For two point charges interacting, each provides an electric field which is related to ...
1vote
1answer
73views
Is it possible to measure the potential difference between two regions that are far apart?
I’m an electronics engineering student with a growing interest in electrochemistry. I’ve learned that to measure the potential difference between two beakers, A and B, with different ion ...
- 13
0votes
3answers
78views
Is the electric force conservative in the presence of a changing magnetic field?
Is the electric force conservative in the presence of a magnetic field? Maxwell's Equations tell us that the curl of $E$ is zero unless there is a changing magnetic field. Conservative forces are by ...
- 309
0votes
1answer
94views
Derivative wrt retarded time
I am confused by the following statement in footnote of Griffiths 4th edition (page 446): $$\frac{\partial }{\partial t_r} = \frac{\partial }{\partial t},$$ where $$t_r=t - \frac{\mathscr{r}}{c}$$ ...
1vote
2answers
49views
Upper and lower bounds in integral for potential
So I have problem with understanding and determining electric potential. I'm going to explain how I think through an example and where it the breaks down in another example. Example 1 from griffiths ...
- 123
1vote
1answer
59views
Charge transferred from Sphere and Disc after being brought into contact
Recently I came upon the following question $-$ A conducting sphere of radius $R = 1 m$ is charged to a potential $V = 1000$ volts. A thin metal disc of radius $r = 1 cm$ mounted on an insulating ...
- 426
1vote
3answers
115views
Electric Potential in circuit confusion
I reviewed some of the fundamental physics and I looked back at the equation for Electric potential at a point p: $$V(p) = k \sum_{i} {\frac {q_i} {r_i}}$$ where p is the point at which the potential ...
- 147
0votes
1answer
30views
Will the potential on surface of a irregular conducting sphere surface be constant?
We know that potential on surface due to a regular conducting sphere is constant. But what will it be when the surface is irregular and charge distribution is non-uniform?
0votes
1answer
152views
Why can't we calculate potential at a particular point due to an infinitely long thin wire with uniform positive linear charge density?
I read in theory that we cannot calculate at a particular point due to an infinitely long thin wire with uniform positive linear charge density. Instead we can only calculate the potential difference ...
- 23
1vote
0answers
77views
Is there a reason why when a parallel-plate setup is immersed under water, the potential difference between them reduces?
I will elaborate upon this question as follows. I was trying to devise an experiment to observe equipotential surfaces of different charge configurations, using a movable probe connected to a ...
- 11
0votes
1answer
61views
Can two different electric field exist for the same potential?
Take the electric field due to a electric dipole. If i do the line integral of this field from infinity to a point 'r' radially then \theta component of field has no role in this integral. So can two ...
- 353
0votes
1answer
65views
EMF Generated according to Faraday's Law
According to Faraday's Law, due to a relative movement between the current carrying loop and the magnetic field, an EMF is induced in the loop causing a current flow. However, according to Maxwell-...
- 321
0votes
1answer
374views
Average electric potential over a spherical volume [closed]
I know the average potential over a spherical surface equals the potential at the center of sphere. But is it also true for average over spherical volume ? In both cases the sphere is empty of charge.
- 105
1vote
1answer
42views
Question on calculation of electrostatic potential?
Find the potential $\phi$ at the edge of a thin disc of radius $R$ carrying the uniformly distributed charge with surface density $\sigma$. It can be done as follows. By definition, the potential in ...
- 197
-1votes
1answer
267views
Is equipotential surface of an electric field actually a magnetic field?
Regarding linearly polarized electric fields that are produced by a dipole antenna and electric fields from a current carrying wire, are the equipotential surface the same as the magnetic fields? ...
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