Transfer of charges between 2 conductors

In summary, the conversation is discussing the transfer of charges between conductors and the concept of capacity. The initial question is whether or not a conductor retains its charges after touching a highly charged conductor. The conversation then delves into the idea of a person touching a Van De Graaff generator and not getting electrocuted, and the transfer of charges between two conductors without a loop. Ultimately, the confusion lies in the apparent contradiction between charges not transferring between two plates of a capacitor that are far apart, but transferring between two isolated conducting spheres connected by a wire.
  • #1
pizzadude
8
1
Hi. If a conductor (A) touches another highly charged conductor (B) such as one on the Van De Graaff generator, then I move conductor A via a string away from conductor B. Does conductor A retain the charges that it had gained when it touched the highly charged conductor?

If conductor A does retain the charges, then why does a person touching the Van De Graff generator does not get electricuted when he steps off the insulating platform and onto the ground. Shouldn't the charges that he retained move from his body to the ground and hurt him?

Similarly, if conductor A touches the positive end of say a 100V DC battery, will there be any charges flowing from the battery to conductor A and remain there even after conductor A has been removed from the battery?

I appreciate anybody's help to clarify this for me.

Thanks
 
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  • #2
Hint: think about "capacity".
 
  • #3
Thanks vanesche. Actually, I did think about capacity when I wrote the questions. I know that the closer the positive and negative plates are in a capacitor, the more charges they can hold given a certain potential difference. So that means that it takes the negative charges nearby to keep the positive charges from going away and vice versa for the positive charges.

I am thinking that maybe your hint implies that there are no transfer of charges between two conductors without maybe another negative conductor nearby. But I ran into a problem in the book where it asks me what the ratio of the charges on two metal spheres is when they are connected to each other. That problem would mean charges do transfer from one positive conductor to another (say) neutral conductor. Doesn't it?
 
  • #4
Based on the capacitance formula for a parallel-plate capacitor: ( C=EoA/d ), capacitance would equal 0 as distance between the plates approaches infinity. That means the plates would not hold any charges when they are connected to a battery if the plates are really far away from each other.

But I've read of so many instances where charges do transfer from one conductor to another conductor without a loop (like the charge of one isolated conducting sphere going over to another conducting isolated sphere when they're connected by a wire).

So, I'm confused by what seems to be contradictory circumstances. One is charges from a battery do not seem to go over to plates that are really far apart and the other is charges from one conducting sphere do go over to another conducting sphere no matter how far apart those spheres are as long as they're connected by a wire.
 

1. How does the transfer of charges occur between two conductors?

The transfer of charges between two conductors occurs through a process called conduction, where charges move from one conductor to another through direct contact. This can happen when there is a difference in the charge distribution between the two conductors, causing the charges to flow until an equilibrium is reached.

2. What factors affect the transfer of charges between two conductors?

The transfer of charges between two conductors can be affected by several factors, including the difference in charge distribution, the conductivity of the materials, and the distance between the two conductors. Higher differences in charge and greater conductivity can lead to faster and larger transfers of charges.

3. Can the transfer of charges between two conductors be controlled?

Yes, the transfer of charges between two conductors can be controlled through the use of insulating materials, which prevent the direct contact of charges between the two conductors. Additionally, devices such as capacitors can be used to store and release charges in a controlled manner.

4. Are there any real-world applications of the transfer of charges between two conductors?

Yes, there are many real-world applications of the transfer of charges between two conductors. Some examples include the operation of electronic devices such as computers and cell phones, the transmission of electricity through power lines, and the functioning of lightning rods to protect buildings from lightning strikes.

5. How is the transfer of charges between two conductors related to static electricity?

The transfer of charges between two conductors is closely related to static electricity, as it is a type of charge transfer that occurs when two objects with different electrical charges come into contact. This can result in shocks, sparks, or other effects commonly associated with static electricity.

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