# Linked Questions

3answers
176 views

### Understanding Capacitors [duplicate]

I cannot understand how capacitors work. Electric field is supposedly uniform between the parallel plates of a capacitor. But how? Since $E=\frac{kq}{d^2}$, shouldn't the electric field approach ...
4answers
53k views

### Force between the plates of a capacitor

As we know that the electric field between two parallel plates of a capacitor is $$E=\frac{\sigma}{\epsilon_0}$$, so the magnitude of force exerted by one plate on the other should have been $$F=QE$$. ...
2answers
9k views

### Electric field between 2 parallel plates

The question state that 2 large parallel plates are a distance $d$ apart and the field at $d/2$ is $E$ if the distance between the plates are reduced to $\frac{d}{2}$ what is the field strength ...
3answers
28k views

### Conducting and non-conducting infinite sheets of charge have same $E$? ($E$= electric field intensity)? [closed]

From my textbook the description is given below to the image.
1answer
16k views

### What is the electric field between and outside infinite parallel plates?

I know that Gauss's law says $$\oint_S {\vec{E} \cdot d\vec{A} = \frac{q_{enc}}{{\epsilon _0 }}}$$ and that because $\vec{E}$ is always parallel to $d\vec{A}$ in this case, and $\vec{E}$ is a ...
2answers
2k views

### Principle of superposition for capacitor

In a capacitor the parallel plates of opposite charge create equal electric fields in opposite directions. We know field outside the capacitor is zero but inside the capacitor it is non zero. My ...
2answers
2k views

### Confusion about surface charge density and electric field intensity of an infinite plate

consider a plate with some thickness. If both surface of the plate have a total of q charge and the area of each surface is A then would the charge density be q/A or q/2A ? And what would be the ...
1answer
320 views

1answer
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### Why is it that only thermal energy is available in a particle propagating throughout a space-charge layer in a plasma (not kinetic)?

In this PDF on page 5 the author explains that a particle moving through a space-charge (electron density in a plasma) gains only thermal energy. Should there not also be kinetic energy?
1answer
22 views

### Slowing down in a electron velocity selector

In an electron velocity selector, we use a positively charged plate (with a slit) to accelerate the electrons which then go through the slit and into an area with an electric and magnetic field. If ...