A point charge near a stream of water

In summary, when a point charge is brought near a narrow stream of water, the water will not be affected by the charge due to its permanent electric dipoles. This is because a uniform electric field will only torque, but not pull or push, a dipole. The forces on a dielectric body in an electric field can be explained using the Maxwell stress tensor, and this concept has been used in the development of fluidic pumps with no moving parts.
  • #1
dogeatdog
2
0

Homework Statement


if a point charge is brought near a narrow stream of water will the water be attracted to the charge, repelled from it, or neither? why? water molecules are permanent electric dipoles.


Homework Equations


not sure


The Attempt at a Solution


i don't think the water would be affected by the charge
 
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  • #2
This comes up a lot.

A uniform electric field will torque but not pull or push a dipole. But a point charge doesn't have a uniform field, right?

Q: what are the forces on a dielectric body in an electric field? The answer has to do with the Maxwell stress tensor. Hint: there are US patents for fluidic pumps with no moving parts that are based on these principles.
 

1. What is the effect of a point charge on a stream of water?

A point charge near a stream of water can cause the water molecules to be attracted or repelled, depending on the charge of the point charge. This can result in changes in the flow or direction of the water.

2. How does the distance between the point charge and the stream of water affect the interaction?

The strength of the interaction between a point charge and a stream of water decreases as the distance between them increases. This is because the electric field of the point charge weakens with distance.

3. Can a point charge affect the properties of water in the stream?

Yes, a point charge can affect the properties of water in the stream. For example, if the point charge has a strong enough electric field, it can cause the water molecules to ionize and create ions in the stream.

4. How does the charge of the point charge affect the interaction with the stream of water?

The charge of the point charge determines the strength and direction of the interaction with the stream of water. A positive charge will repel the water molecules, while a negative charge will attract them.

5. Is there a limit to the distance over which a point charge can affect a stream of water?

There is no exact limit to the distance over which a point charge can affect a stream of water. However, the strength of the interaction decreases significantly as the distance increases, so the effect may become negligible at a certain distance.

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