# Questions tagged [charge]

A fundamental property of matter which causes it to experience electromagnetic forces.

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### Symmetrical, spherical charge distribution [closed]

I have this problem from my Electromagnetism class, but I don´t have a lot of idea in how to solve it. Show that for a symmetrical, spherical charge distribution $\rho(\vec{r})=\rho(r)$ (with $r$ ...
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### Alpha particle moving faster than the speed of light

In this problem I was solving a beam of uniform cross section carrying a current of $0.25\ \mu A$ by alpha particles. The mass of an alpha particle is $m_\alpha=4m_p$, where $m_p$ is the mass of a ...
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### Energy Density of Charged Non-Conducting Sphere

I know how the Energy density of conducting and non-conducting shells is derived by using the argument of electrostatic pressure. It comes out to be ½(E²ɛ₀).But when I try to derive it via the same ...
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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 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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