All Questions
Tagged with electromagnetism capacitance
241
questions
60
votes
16
answers
15k
views
Intuitively, why does putting capacitors in series decrease the equivalent capacitance?
Can someone please explain, intuitively (without any formula, I understand the formulas), why the equivalent capacitance of capacitors in series is less than the any individual capacitor's capacitance?...
31
votes
10
answers
8k
views
How is energy "stored in an electric field"?
My physics teacher told me the statement "The energy of a capacitor is stored in its electric field".
Now this confuses me a bit. I understand the energy of a capacitor as a result of the ...
- 492
22
votes
5
answers
57k
views
What is the difference between a battery and a charged capacitor?
What is the difference between a battery and a charged capacitor?
I can see lot of similarities between capacitor and battery. In both these charges are separated and When not connected in a circuit ...
- 7,335
19
votes
4
answers
2k
views
Distorted colors of Google StreetView photographs near electric power lines
This is a followup to my question:
Cyclist's electrical tingling under power lines
Some users presented a convincing picture that the electric shocks under power lines are primarily from the ...
- 180k
19
votes
2
answers
999
views
Are there analogs to resistance, inductance, capacitance, and memristance connecting the weak force to electromagnetism?
A question was asked over at EE.SE recently which I tried to answer, but much of my answer was speculative. I'm hoping someone here can help my ignorance.
In electronics design, there are four ...
- 429
15
votes
5
answers
2k
views
Where's the energy in a boosted capacitor?
Suppose I look at a parallel plate capacitor in its rest frame and calculate the electrostatic energy, $E$.
Next, I look at the same capacitor in a primed frame boosted in the direction perpendicular ...
- 53.2k
14
votes
9
answers
8k
views
What happens if you use a battery to charge up a capacitor fully, and then disconnect the battery, where does the charge 'go'?
The title says it all really, but I think that since the battery is disconnected there is now an 'open circuit'. I know that charge can only flow if the circuit is complete (closed).
But the part that ...
- 640
11
votes
5
answers
11k
views
Why does a ceiling fan start up slowly? [closed]
I think it probably has something to do with the capacitor inside but I don't get it why doesn't it just Start spinning instantly when we push the button why does it slowly start to spin and gradually ...
- 173
10
votes
4
answers
4k
views
Where does the extra energy come from in an LC circuit?
In an LC circuit, or an LC tank, the capacitor discharges in one direction
through an inductor and then the inductor seems to carry energy in the form of a magnetic field , to charge the capacitor ...
- 607
10
votes
5
answers
3k
views
Is there a magnetic field around a fully charged capacitor?
I know that a magnetic field exists when a capacitor is in the process of charging/discharging:
(a) But what if the capacitor is fully charged? Will the magnetic field still persist? Something like:
...
- 649
8
votes
1
answer
2k
views
What does a relativistically moving capacitor "look" like? [duplicate]
Suppose I have a parallel plate capacitor with a vacuum between the plates, a voltage $V$ across them and a capacitance of $C$.
What will this arrangement look like to an observer in a uniformly ...
- 133k
6
votes
3
answers
4k
views
Why do Capacitor Inductor circuits Oscillate instead of reaching equilibrium?
When the capacitor is fully charged there is a potential difference between its poles and that creates a current.
This current would create a magnetic field that is changing in the Inductor (because ...
- 411
6
votes
4
answers
3k
views
What is the current of a capacitor when the derivative of voltage is undefined?
This is from the textbook I am reading:
I know this equation for capacitors:
$$i=C\cdot \frac { dv }{ dt }$$
Here is my question: how can diagram (a) be allowed if the derivative of the voltage ...
- 63
6
votes
3
answers
1k
views
Physics olympiad question about a charge capacitor
This is problem 1463 from the Russian magazine Quant.
Unfortunately my Russian is not good enough, so I apologize if the translation of the problem contains errors.
Problem. Inside a flat charge ...
- 417
6
votes
2
answers
805
views
Interpretation of Poynting Vector
Short Version
How exaclty can the Poynting vector be physically interpreted for static electric and magnetic fields?
I know that it describes the magnitude and direction of energy flow in EM-waves. ...
- 106