Basic Electricity Question - Potential Electric

In summary, the conversation discusses the transfer of electrons between a plate with a charge of -3.0 uC and a rod with a charge of +2.0 uC in order to equalize the charges on both objects. The solution suggests transferring 2.5 uC from the rod to the plate, resulting in a final charge of -2.5 uC and +2.5 uC on the plate and rod, respectively. The number of electrons transferred is calculated to be 1.25e13. There is also a discussion about the accuracy of the solution and clarification on the final charge values.
  • #1
cheechnchong
132
1

Homework Statement



Question: a plate carries a charge of -3.0 uC, while a rod carries a charge of +2.0 uC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?


The Attempt at a Solution



N= q/e = -2.0e-6/-1.6e-19 = 1.25e13 electrons transferred

something doesn't seem right about this problem. the prof didnt mark this wrong, but he marked -2.0e-6 C wrong? anyone with the fix?
 
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  • #2
If you transfer 2uC from the rod to the plate, what will be the charges on both objects?
 
  • #3
Galileo said:
If you transfer 2uC from the rod to the plate, what will be the charges on both objects?

-3.0 uC and +2.0 uC ...when you sum them up you get -1.0 uC? each with -0.5 uC? then, 2.5 uC when you subtract from 3.0 uC?

find how many electrons in 2.5 uC? is that how much is transferred?

too many questions!:confused: :confused: :confused:
 
  • #4
think that's right, eg taking away from one and giveth to the other;
-3-deltaC=2+deltaC so -2.5uC
 
  • #5
^^that's it right? just calculate electrons for 2.5 uC and that's that right?
 
  • #6
You're good best I can tell, but technically its -2.5uC, some profs might not care, others most definitely will.
 
Last edited:
  • #7
appreciate it doc. i'll go ahead and take your word.
 

1. What is electric potential?

Electric potential is the amount of electrical potential energy that a unit charge has at a certain point in an electric field. It is measured in volts (V).

2. How is electric potential different from electric potential energy?

Electric potential energy is the amount of potential energy that a charged particle has due to its position in an electric field. Electric potential, on the other hand, is the potential energy per unit charge at a specific point in an electric field.

3. What is the difference between AC and DC voltage?

AC (alternating current) voltage changes direction periodically, while DC (direct current) voltage only flows in one direction. AC voltage is commonly used in household electricity, while DC voltage is used in electronics and batteries.

4. How is electric potential measured?

Electric potential is measured using a voltmeter, which is a device that measures the potential difference between two points in an electric field. The unit of measurement for electric potential is volts (V).

5. How does electric potential affect the flow of electric current?

The difference in electric potential between two points in an electric field is what causes electric current to flow. The higher the electric potential difference, the greater the flow of electric current.

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