# Questions tagged [electrostatics]

Electrostatics is concerned with the electrical fields and scalar potentials of stationary electrical charges and charge distributions. Use this for questions about electromagnetic situations in which currents and magnetic fields are absent, otherwise use the [electromagnetism] and/or [magnetic-fields] tags.

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1answer
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### Do propagating electric fields have energy stored in them?

We know that speed of electric field is C in space, when we place a charge say at location P the electric fields from P travels outward and signal reaches other places later than charge was placed at ...
2answers
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### How come the filled water bottle work as a stylus for phone but not the empty bottle?

Take an empty plastic bottle, and make it slide on a mobile screen. You would find that it's not doing anything. Now filled up this bottle with water and try doing the same. This time you will find ...
1answer
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### Charge on a conducting sphere

As far as I know, to have a net flex through a closed surface there must be a charge inside it. However, what if I have for example a conducting sphere where the charge accumulate on the surface, will ...
0answers
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### Do neutral conductors be attracted to a Van de Graff generator?

As far as I know, static electricity occurs when we have one object becoming positively charged, and another negatively charged, due to contact between them (usually rubbing). Those objects will than ...
0answers
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### How to calculate a volume integral from a data file containing $x$, $y$ and $z$ coordinates and electric field value at each $(x,y,z)$? [migrated]

I have a data file from a simulation that contains $E$-field values at different coordinates $(x,y,z)$. I want to calculate the integral $\int E^{2} dV$ over a cylindrical volume in Python or MATLAB. ...
2answers
39 views

### What is meant by a potential of an object in context of electricity?

On my journey on learning about electricity and voltage in particular, I asked a few questions in this site. And I often come across terminology of relating potential to objects, like for example in ...
1answer
30 views

### Gauss's Law for planes

Why when we apply Gauss's Law on a conducting plane we choose the Gaussian surface to be a cylinder which one end of it is inside the conductor, whereas when we apply Gauss's Law on an insulating ...
0answers
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### Discharge of static electricity

I watched this video about static electricity and I wanted to verify that I understand correctly. What we see in the picture is one lady touching with one hand this device that generates static ...
1answer
32 views

### What is the difference between electric current and electric discharge?

We know that when we have 2 oppositely charged objects (As in static electricity for example), when one of these materials will come in touch with a neutral conductor, there will be a discharge - ...
0answers
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### Conductors vs insulators with static electricity

I hope I can make this clear enough: I am trying to understand: what are the rules/constraints regarding to the materials that can produce static electricity? I'll start with what I know about ...
1answer
34 views

### How does earthing happen?

Earthing, as I have been told, is done by inserting a conductor in the ground whilst it is connected to the body whose earthing needs to be done. But how does the charge get transferred into the ...
1answer
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### I am confused on how to think about potential energy stored in capacitors [duplicate]

Energy stored in capacitors is represented by $$U = \frac{1}{2} QV$$ Now I have heard 2 reasons why there’s a half factor, unlike the general potential energy equation, which is $U = QV$. Capacitors ...
1answer
49 views

### Is voltage a difference between two charged objects or two positions in a field?

I'm awfully confused about the concept of voltage. I know that it is "difference in electric potential between two points", and that voltage is always between 2 points. There is no ...
1answer
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### How to identify series and parallel connections of capacitors in complex circuits? [closed]

Like for this question (picture attached) how to identify if capacitors are in series or in parallel?
2answers
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### Does energy of a capacitor means energy stored in both plates?

I've a doubt in this, Does the term potential energy of a parallel plate capacitor means the energy stored in both the plates or a single plate, since the formula $E=Q^2/2C$ , $Q$ is the charge of ...
1answer
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### Tricky thought on Gauss's law

When the charge enclosed by a gaussian surface is equal to $q/2$ nought shouldnt the number of field lines be equal to half which does not make sense at all.
2answers
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### What is the equilibrium of two equal charges on a pendulum? [closed]

Suppose you have two equal point charges of magnitude $q$ and mass $m$ suspended by strings of length $L$ on opposite sides of a pendulum, both making an angle of theta with the $y$-axis. The question ...
1answer
44 views

### Is this a correct way to think about 2 batteries connected in series?

Ok in this thread I asked about the potential difference between two separate batteries. My thought was, that if a voltage of a battery is all about potential difference between the two terminals, ...
2answers
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2answers
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### Does charge develop on the surface of a current carrying wire?

Well i think electric field must exist outside a current carrying conducting wire. Because if you consider a simple circuit with a resistor and a battery potential difference is created across the ...