# 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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### Can you magnetize iron by putting it in the air cap of a two parallel plates capacitor?

Usually we magnetize iron by putting it inside a solenoid strong homogeneous field and charging/discharging the solenoid several times. I am asking if we can magnetize an iron piece by putting it ...
• 2,994
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### Bio Savart Law and volume of sphere?

$\frac {4\pi r^3}{3}$ is the volume of a sphere and it appears in this equation. I understand the cross product is the area of a parallelogram, but am curious how this volume is involved in the ...
• 209
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### Charges on conducting shell with a conducting sphere inside it

If I have a spherical capacitor which is composed of a conducting sphere surrounded by a conducting shell and the space between them is filled with a dielectric , I assumed that the charge on the ...
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### The image contains the question. The image descriptions contains my DOUBT

When the charges are at the extreme positions, the velocities of both the charges will be zero. DOUBT : Can we say that the net force acting on both the charges at the extreme position is also equal ...
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### Superposition principle for the electric field

I had read somewhere that superposition principle is valid for linear functions, but the electric field is not a linear function, then why is the superposition principle valid for electric field?
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### What is $Q$ in the energy stored in a parallel plate capacitor?

If we have a parallel plate capacitor like the one below the energy stored in it can be give by $$U=\frac{Q^2}{2C}$$ $\bullet$ C is the capacitance of the capacitor Now is the $Q$ the free charge on ...
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### A bottle weights 4.5kg, what's its mass in TeV (Terra Electronvolts)? [closed]

I'm not entirely sure about this problem. And the second one says: An apple falls down from a height of 1 meter. What's it's kinetic energy? My thoughts: 1/2gt^2= 1 meter -> solve for t, then v=s/t ...
1 vote
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### How is surface charge induced on the surface of circuit wires when connected to a battery?

Understanding: I watched the newest Veritasium electricity video and he said that the electric field inside the wires of the circuit that causes the electric current to flow is created by both the ...
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### A solid, insulating sphere of radius a = 4.9cn has a uniform charge density / . Find the magnitude [closed]

A solid, insulating sphere of radius a = 4.9cn has a uniform charge density on its volume of rho = 25.5 muC / (m ^ 3) . Concentric with ( this sphere is an uncharged (بالمركز conducting, hollow () ...
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### Why charges does not move through the conductor here if potential at both ends of wire is same?

Two conducting solid spheres are kept apart, one with charge Q1 and radius R1 and the other with charge Q2 and radius R2. Q1=5Q2 and R1=5R2 When these spheres are connected by a conducting wire, the ...
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### What is the capacitance of ferrodoxin molecule?

On Wikipedia it says that a ferrodoxin molecule is a biological capacitor which transfers electron to change the oxidation state of iron from $\text{Fe(II)}$ to $\text{Fe(III)}$. Now I simply want to ...