Static Electric Fields: Interactions Explored

In summary, the charges do interact and repel each other in a charged conductor, causing them to spread out on the surface. This results in a cancellation of the electric field in all directions except for the one pointing radially outward, which is perpendicular to the surface of the conductor. In a uniformly charged object, this can result in only one field line being shown even though there are many charges present. Gauss' law only works as an approximation for infinitely long charged wires or cylinders, and can be affected by the length and proximity of the wire or cylinder.
  • #1
Jus chek out careful when we have uniform electric charge distribution along wire or a sphere etc! Is there no any interaction between the charges in that uniform distribution!

then look at the capacitor we only see straight field lines from positive charged plate to the negative charged plate are no more electric interaction that i expected ie. Between the adjacent charges on a plate or between two different charges in two different plates that are not connected by a straight horizontal field line!

may anyone help me out on what really hapens?
 
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  • #2
The charges do interact. :smile: They repel each other.

You may have heard that within a charged conductor, the (excess) static charges are always on the surface (and only on the surface). That's because they are repelling each other. In essence, they are "trying" to get as far away as they can from any other charge or group of charges. But since all the other charges are "trying" to the same thing, they just end up spreading out over the surface. Eventually, the charge distribution of the surface charges on a conductor align themselves in just such a way that the electric field in the conductor is 0.

Your textbook might not show the electric field lines in between charges on the same plate, only because it's probably not relevant to the problem. But they are there.

And the electric field lines in-between the plates do curve somewhat as you move toward the edge. Often this is ignored in a typical capacitor because the distance between the plates is so tiny compared to the length of the plates.
 
  • #3
Thanks man! But what i know is that every charge radiates electric fields radialy outwards

but what i clearly see on a uniformly charged object is that only a single field among many seems to be shown

also what hapens until a charge on one end of a linear charge distributed conductor can't cause electric flux on the plates of the cylindrical gausian surface drawn!

may u tel me clearly on the interaction and at the same time gauss law says that the net sum of flux is the algebraic sum of the flux due to each charge while the diagram shows that some flux are neglected and i don't really understand what hapens to it?
 
  • #4
Godwin Kessy said:
Thanks man! But what i know is that every charge radiates electric fields radialy outwards

Yes, but since there are many charges being modeled (an infinite amount of infinitesimal charges in a uniformly charged object), the electric field often cancels out in all components except for the component perpendicular to the surface (this is certainly true for a conductor).

Imagine an infinitely long, charged wire laying horizontally on the x-axis. A given infinitesimal point charge will have electric field lines drawn spherically outward. So some of its electric field will be drawn in the general direction of the positive x direction. But there is also another infinitesimal charge right next to it, slightly further along the x-axis, who's field lines point in the negative x-axis direction (in-part), canceling out the field line components of the first charge, but only in the x direction. Now if you put an infinite amount of infinitesimal charges on the line all electric field lines cancel except for the field lines pointing radially away from the line.

but what i clearly see on a uniformly charged object is that only a single field among many seems to be shown

Yes, this is due to cancellation of the different components of the different charges. Everything sums up to zero, except for the component pointing radially outward. In a charged conductor, this direction is always perpendicular to the surface, when measured at the surface itself.

also what hapens until a charge on one end of a linear charge distributed conductor can't cause electric flux on the plates of the cylindrical gausian surface drawn!

may u tel me clearly on the interaction and at the same time gauss law says that the net sum of flux is the algebraic sum of the flux due to each charge while the diagram shows that some flux are neglected and i don't really understand what hapens to it?

Guass' law only works for an infinitely long charged wire or cylinder, when using a cylindrical Gaussian surface. If the charged wire/cylinder is less than infinitely long, Gauss' law is only an approximation. But it's a pretty good approximation if the place of interest is not near one of the edges, and if the distance to the cylinder/wire is small compared to the length of the cylinder/wire.
 
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  • #5


I can provide some clarification on the concept of static electric fields and their interactions.

First, it is important to understand that electric fields are created by the presence of electric charges. When we have a uniform distribution of electric charges along a wire or a sphere, the electric field produced by these charges will also be uniform. This means that the strength and direction of the electric field will be the same at any point along the wire or sphere.

In this scenario, there is indeed interaction between the charges in the uniform distribution. The electric field produced by each charge will interact with the electric field produced by the other charges, resulting in a uniform electric field overall.

Now, let's consider the example of a capacitor. A capacitor consists of two parallel plates with opposite charges on each plate. In this case, the electric field is not uniform, but rather concentrated between the plates. This is because the electric field lines are "squeezed" between the plates and do not spread out evenly like in the case of a wire or sphere.

However, there is still interaction between the charges in the capacitor. The positive and negative charges on each plate will attract each other, and the electric field between the plates will influence the charges on the plates.

So, to answer your question, there is indeed interaction between the charges in a uniform distribution, as well as in a capacitor. The difference lies in the type of electric field produced by the charges. In a uniform distribution, the electric field is uniform, while in a capacitor, the electric field is concentrated between the plates.

I hope this explanation helps clarify any confusion you may have had. If you have any further questions, please don't hesitate to ask.
 

What is a static electric field?

A static electric field is a force field that is created by stationary electric charges. It exerts a force on other electric charges, either attracting or repelling them.

How is a static electric field different from a magnetic field?

A static electric field is created by stationary electric charges, while a magnetic field is created by moving electric charges. Additionally, electric charges interact with both electric and magnetic fields, whereas magnetic charges (or monopoles) only interact with magnetic fields.

What are some common sources of static electric fields?

Static electric fields can be generated by rubbing materials together, such as when you rub a balloon on your hair and it sticks to the wall. They can also be created by electronic devices, such as televisions and computers.

How do materials become charged in a static electric field?

Materials become charged in a static electric field when electrons are either added or removed from their atoms. This can happen through friction, conduction, or induction.

What are some practical applications of static electric fields?

Static electric fields have many practical applications, such as in electrostatic precipitators used to remove dust particles from air, inkjet printers, and photocopiers. They are also used in electronic devices such as capacitors and transistors.

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