Static Charge Induction: Rod and Sphere Experiment

In summary, the conversation discusses the concept of charges and induction in relation to a rod being brought close to two insulated spheres. It is concluded that the positive charge will move to one sphere while the negative charge will remain at the other, resulting in one positively charged sphere and one negatively charged sphere.
  • #1
Ammar Qasim
7
0

Homework Statement



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Homework Equations


The Attempt at a Solution


I think it depends on induction so when the rod is brought close, the spheres will be positively charged. When they move away of it, A will get a negative charge "by induction" and B will get a positive one
 
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  • #2
Ammar Qasim said:

Homework Statement



e78-1341-443c-b923-f7d096e7756b&out=http%3A%2F%2Fwww3.0zz0.com%2F2013%2F08%2F13%2F17%2F522810097.png


Homework Equations





The Attempt at a Solution


I think it depends on induction so when the rod is brought close, the spheres will be positively charged. When they move away of it, A will get a negative charge "by induction" and B will get a positive one

Hi Ammar Qasim, Welcome to Physics Forums.

Since the spheres are on insulated stands and the rod never contacts the spheres, charges can only move around, and no new charges will enter the system (conservation of charge). The two spheres start out neutral (zero net charge). Further, charge can only move where there is a conduction path. What does this tell you about the sum of the charges on the two spheres after they are made separate?

When the spheres are in contact and the rod is brought close, make an approximate sketch of the distribution of charges on the spheres. What will it look like?
 
  • #3
gneill said:
Hi Ammar Qasim, Welcome to Physics Forums.

Since the spheres are on insulated stands and the rod never contacts the spheres, charges can only move around, and no new charges will enter the system (conservation of charge). The two spheres start out neutral (zero net charge). Further, charge can only move where there is a conduction path. What does this tell you about the sum of the charges on the two spheres after they are made separate?

When the spheres are in contact and the rod is brought close, make an approximate sketch of the distribution of charges on the spheres. What will it look like?

Hi gneill, thank you for help.
When rod is brought close the positive charge will move to A and the negative charge will move to B then A will be attracted to the rob holding the positive charge so the answer will be letter B. Did I get it ?
 
  • #4
Ammar Qasim said:
Hi gneill, thank you for help.
When rod is brought close the positive charge will move to A and the negative charge will move to B then A will be attracted to the rob holding the positive charge so the answer will be letter B. Did I get it ?

No. What happened to the negative charge that you say moved to B? Where does it go if you say that sphere B ends up neutral while sphere A is positive?
 
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  • #5
gneill said:
No. What happened to the negative charge that you say moved to B? Where does it go is you say that sphere B ends up neutral while sphere A is positive?

Oh, you are right. the negative charge will remain at B so the answer will be letter (A)
 
  • #6
Ammar Qasim said:
Oh, you are right. the negative charge will remain at B so the answer will be letter (A)

Looks good :smile:
 

1. What is static charge?

Static charge is a type of electric charge that occurs when there is an imbalance of electrons on the surface of an object. This buildup of electrons creates a strong electric field that can cause objects to attract or repel each other.

2. How is static charge created?

Static charge is created when two objects come into contact and then separate, leaving one object with an excess of electrons and the other with a deficit. This can also occur when objects rub against each other, with the friction causing the transfer of electrons.

3. What are the effects of static charge?

Static charge can cause objects to stick together or repel each other, depending on the charges of the objects. It can also cause objects to cling to surfaces, such as hair sticking to a balloon. In some cases, static charge can cause sparks or shocks when discharged.

4. How can static charge be controlled?

Static charge can be controlled by grounding the objects or using materials that are conductive. This allows the excess electrons to flow away, neutralizing the charge. Anti-static materials, such as dryer sheets, can also be used to reduce static charge.

5. Is static charge harmful?

In most cases, static charge is not harmful. However, in industrial settings, it can be a safety hazard if it causes sparks in the presence of flammable materials. It can also be a nuisance, causing discomfort or damage to electronic devices.

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