Charge by Contact: Net Charges on Each Sphere?

In summary, after the negatively charged rod touches one of the uncharged spheres, it transfers electrons to both spheres. When the rod is taken away, the spheres have a net charge of -1 and +1 respectively. The explanation of "charge by contact" is correct in this scenario.
  • #1
kiplings01
6
0

Homework Statement


Two uncharged spheres are touching (they are held by insulating stands). A negatively charged rod touches the sphere on the left. After, rod is taken away and the adjacent sphere (the one that the rod did not touch) is separated. What are the net charges on each sphere?


Homework Equations





The Attempt at a Solution


After rod is taken away, the 0 charge restores to each spheres touching even before the second sphere is separated from the first that was touched by the rod. OR. the sphere that was touched by the rod is + charged becaused of charging by contact and second sphere that is moved is negatively charged. Which explanation (if any is correct) is right?
 
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  • #2
Sorry, both are wrong.

This was "charge by contact." The negatively charged rod has transferred electrons to the spheres. So what net charge is on the spheres? (the rod is taken away first, so no electrons are jumping back).
 
  • #3
Chi Meson said:
Sorry, both are wrong.

This was "charge by contact." The negatively charged rod has transferred electrons to the spheres. So what net charge is on the spheres? (the rod is taken away first, so no electrons are jumping back).

Are they both negatively charged because of the electrons transferred?
 

1. How does charge by contact work?

Charge by contact is a method of transferring charge between two objects through direct physical contact. When two objects with different net charges come into contact, some of the charge from one object will transfer to the other, resulting in a redistribution of charges on both objects.

2. What are the factors that affect charge transfer by contact?

The amount of charge transferred by contact is affected by the difference in net charges between the two objects, the surface area of contact, and the material properties of the objects.

3. What is the net charge on each sphere after charge by contact?

The net charge on each sphere after charge by contact depends on the initial net charges of the two objects and the amount of charge transferred during contact. If two neutral objects come into contact, the net charge on each sphere will be equal and opposite.

4. Can charge by contact change the total charge of a closed system?

No, charge by contact can only redistribute the charges between two objects. The total charge of a closed system remains constant, according to the law of conservation of charge.

5. How is charge by contact different from charge by induction?

In charge by contact, the transfer of charge occurs through direct physical contact between two objects. In charge by induction, the net charge of an object is influenced by the presence of a charged object nearby, without any physical contact between the two objects.

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