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Electric potential and conducting wire

  1. May 18, 2014 #1
    There are two sphere of radius a and b and they are connected by conducting wire. Then why the electric potential becomes same of both the sphere?
     
  2. jcsd
  3. May 18, 2014 #2

    berkeman

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    Staff: Mentor

    Let's say there was a small potential difference initially between the spheres when you connected them with the conducting wire. What happens next?
     
  4. May 18, 2014 #3
    I don't know what happens next that was I am asking to you. Why potential becomes same?
     
  5. May 18, 2014 #4

    berkeman

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    And I'm asking you -- when you have a potential difference across a conducting wire's ends, what happens? Approximate the wire as a 1 Ohm resistor for simplicity. What is Ohm's Law?
     
  6. May 18, 2014 #5
    I think electron will move from higher potential to lower potential.
     
  7. May 18, 2014 #6

    berkeman

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    Good! What does that electron movement do to the overall potential difference between the two spheres?
     
  8. May 18, 2014 #7
    Electron moving from higher potential it will release the energy and higher potential decrease?
     
  9. May 18, 2014 #8

    berkeman

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    Correct, the potential decreases. Just think of the 2 spheres as the 2 plates of a parallel-plate capacitor. When you have a charged-up capacitor, and you connect a resistor across the terminals of the capacitor, the capacitor discharges through the resistor until there is 0 Volts across the capacitor (so the plates are at the same potential).

    Does that make sense?
     
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