Electrostatic equilibrium, deflection of a cobweb

In summary, the conversation discusses finding the distance between two charges using the given angle and other variables. The hint suggests finding a relationship between the distance and the angle to solve the problem.
  • #1
marcusesses
24
1

Homework Statement



9KbiO40.png

Homework Equations



After creating a FBD and analyzing the forces, I get the equation for the angle as

## tan \theta = \frac{k q^2}{m g r^2} ##

The Attempt at a Solution


[/B]
I have tried to find a way to find the distance between the charges ## r ##, but the only way I can think of to find it required the angle. I do not know how the question can be solved without knowing at least one of the two variables, and my first inclination is just to assume there is not enough information.

Any help would be appreciated! Thanks!
 
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  • #2
I think you can write another equation for r in terms of theta using the geometry alone..

Hint: You are given the dimension 0.35m
 
  • #3
marcusesses said:
I have tried to find a way to find the distance between the charges r r , but the only way I can think of to find it required the angle.
Find the relationship between r and ##\theta##.

(CWatters beat me to it while I was snoozing!)
 

FAQ: Electrostatic equilibrium, deflection of a cobweb

What is electrostatic equilibrium?

Electrostatic equilibrium is a state in which the electric charges in a system are distributed in such a way that there is no net flow of electric current. This means that the electric forces between the charges are balanced, resulting in a stable system.

How is electrostatic equilibrium achieved?

Electrostatic equilibrium is achieved when the electric charges in a system are able to move freely and redistribute themselves until no further movement occurs. This can be achieved through the use of insulating materials or by grounding the system.

What is the deflection of a cobweb?

The deflection of a cobweb is a phenomenon that occurs when a charged object is brought near a cobweb. The electric field of the charged object causes the cobweb to bend and move towards the object, demonstrating the presence of an electric field.

How does the deflection of a cobweb relate to electrostatic equilibrium?

The deflection of a cobweb is a visual demonstration of the electric field created by a charged object. In electrostatic equilibrium, the electric field is balanced and there is no net flow of electric current. The deflection of a cobweb can help to illustrate this concept.

Can the deflection of a cobweb be used to measure the strength of an electric field?

Yes, the deflection of a cobweb can be used to indirectly measure the strength of an electric field. By measuring the distance the cobweb moves and the known charge of the object, the strength of the electric field can be calculated using Coulomb's law.

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