All Questions
Tagged with voltage electromagnetism
256
questions
0
votes
2
answers
49
views
Maxwell stress tensor on a capacitor late given a dielectric
Given a capacitor with large plates (area $A$) separated by a dielectric with relative permittivity $\varepsilon_r$ and thickness $g$, I believe the Maxwell stress tensor states that the force on each ...
0
votes
1
answer
49
views
Voltage drop across an ideal inductor
I was afraid to type the title of the question though there are lot of answers to similar questions. I spent half a day going reading these questions and trying to understand the answers posted and ...
- 65
1
vote
3
answers
105
views
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 ...
- 135
1
vote
2
answers
63
views
Why can define the electric potential (voltage) in alternating current?
(All SI unit used in this question)
The electric potential U is defined in electrostatic field that The electric field is the (negative) gradient of some scaler verctor, if and only if the electirc ...
- 13
0
votes
3
answers
92
views
Why does current increase in step-down transformer?
I'm trying to make sense of transformers.
$\varepsilon_{p} = $ emf in primary coil, $\varepsilon_{s} = $ induced emf in secondary coil, $N_{p} = $ number of turns in primary coil, $N_{s} = $ number of ...
3
votes
3
answers
428
views
Confusion about Circuits
I have two questions:
When dealing with simple DC circuits, it is often said that the electrons in the wire move because the charge density of the surface charges decreases. Is that due to the fact ...
- 308
0
votes
2
answers
111
views
Definition of voltage for motional EMF
In the schoolbook physics example of a generator, the wire loop rotating in a constant (both in space and time) magnetic field, we can measure a non-zero voltage between the loop's two terminals due ...
- 545
0
votes
1
answer
83
views
What is the electric potential difference for two spheres capacitors connected in series [closed]
Consider two spherical capacitors with Identical radii for the inner and outer spheres (let them be a and b). +q and -q charges are in the inner and outer sphere on Both the capacitors. Now I connect ...
- 123
0
votes
0
answers
23
views
Fowler-Nordheim tunneling following high voltage and voltage breakdowns in X-ray tubes
I am taking some measurements concerning a vacuum based X-ray tube. One has to ramp up the voltage slowly in a process called conditioning of the tube. Without allowing a current to flow along the ...
- 173
1
vote
0
answers
20
views
Does an electric field induce current in a floating ideal capacitor?
The company "Fluke" makes a DMM that they claim can measure AC voltage by simply clamping the connector around a live wire, and using the E-field to induce a voltage/current into the ...
0
votes
2
answers
76
views
Which law defines the AC inducing voltage in the inductor?
If we connect an inductor without ohmic resistance to the alternating voltage source, voltage should induce in the inductor because of the Faraday's law. Voltage is induced by changing magnetic flux ...
- 515
1
vote
1
answer
52
views
How can Current Flow through the Inductor in the AC Circuit? [duplicate]
It's said that if the inductor is connected to the alternating voltage source, alternating current will be created in the circuit. Changing magnetic flux through the inductor will induce a voltage as ...
- 515
0
votes
0
answers
19
views
Transformer primary Voltage and emf relation
This is a conceptual query. So if possible kindly answer more conceptually.
Consider an ideal transformer. We have a input voltage Vp, and voltage in secondary coil as Vs.
now, we write emf equations,...
0
votes
0
answers
60
views
Potential effects of magnets on a Police Taser?
I couldn't find any similar topics and was curious if anyone had thoughts on the following:
Could a magnet (ceramic and/or neodymium etc.) have an adverse affect on a Police Taser, if held to the ...
0
votes
0
answers
49
views
Is this statement about conservative fields and parallel circuits correct?
I am wondering if this statement about parallel circuits and conservative fields is true?:
The voltage drop over resistors in parallel is the same because the electric field is conservative, so the ...
- 199