physics

if a 5microfarad capacitor is charged by a 20volts battery and it is then connected across an uncharged 20microfarad capacitor , find the potential energy

  1. 👍 0
  2. 👎 0
  3. 👁 197
  1. Find the PE of what?

  2. 5*10^-6 = Q/20
    Q = 10^-4

    That charge is distributed on the new capacitance of C = (5+20)10^-6 = 25 *10^-6

    V = Q/C
    V = 10^-4/(25*10^-6) = 10^2/25 = 4 Volts

    Energy = (1/2) Q V = .5 *10^-4 * 4
    = 2*10^-4 Joules

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    a 2uF capacitor is charged to a potential of 200v and then isolated. When it is connected in parallel switch a second capacitor which was initially not charged, the common potential becomes 40v. The capacitance of the second

    asked by Diana on June 22, 2019
  2. physics - conceptual

    Three identical capacitors are connected in series to a battery. If a total charge of Q flows from the battery, how much charge does each capacitor carry? A)9Q B)Q/3 C)Q D)3Q E)Q/9

    asked by Liz on February 3, 2013
  3. physics

    An isolated capacitor of unknown capacitance has been charged to a potential difference of 100 V. When the charged capacitor is then connected in parallel to an un- charged 10.0 μF capacitor, the potential difference across the

    asked by dani on May 24, 2016
  4. physics

    A C1= 2.50uF capacitor is charged to 862 V and a C2= 6.80uF capacitor is charged to 660 V . These capacitors are then disconnected from their batteries. Next the positive plates are connected to each other and the negative plates

    asked by Steve on March 8, 2013
  1. Physics -conceptual

    A 1 mF, a 2 mF, and a 3 mF capacitor are connected in series, the combination being connected across a 9 volt battery. Which capacitor has the greatest voltage?

    asked by Liz on February 3, 2013
  2. Physics

    A series arrangement of three capacitors of value 8μF, 12μF, 24μF is connected in series with a 90-V battery. (i) Draw an open circuit diagram for this arrangement. (ii) Calculate the effective capacitancee in the circuit.

    asked by Koffi on May 1, 2020
  3. AP PHYSICS

    A 3.0-uF capacitor and a 4.0-uF capacitor are connected in series across a 40.0-V battery. A 10.0-uF capacitor is also connected directly across the battery terminals. Find the total charge that the battery delivers to the

    asked by Becky on April 1, 2008
  4. Physics

    A 2.0-microF capacitor is charged to 50V and then connected in parallel (positive to positive plate) with a 4.0-microF capacitor charged to 100V. (a) What are the final charges on the capacitors? (b) What is the difference across

    asked by gOOD eVE on April 24, 2016
  1. physics

    Two capacitors, C1 = 5 μF and C2 = 12 μF, are connected in parallel, and the resulting combination is connected to a 9 V battery. Find (a) the equivalent capacitance of the combination, (b) the potential difference across each

    asked by maram on May 13, 2019
  2. Physics

    Two capacitors are identical, except that one is empty and the other is filled with a dielectric (k = 4.2). The empty capacitor is connected to a 14 -V battery. What must be the potential difference across the plates of the

    asked by Aine on February 26, 2018
  3. Physics

    A 3.00 uF and a 5.00 uF capacitor are connected in series cross a 30.0V battery. A 7.00 uF capacitor is then connected in parallel across the 3.00 uF capacitor. a)Calculate the equivalent capacitance of the circuit I think the

    asked by ALan on February 16, 2010
  4. physics

    When a capacitor are plugged into the battery, what happens to the Q(charge), potential difference, and C. It would have the same effect if two capacitors connected in parallel plugged into the battery

    asked by blast on August 15, 2010

You can view more similar questions or ask a new question.