physics

A 10uf capacitor is charged from a 30v supply and then connected across an uncharged 50uf capacitor.Calculate
a. The final potential difference across the combination
b. The final and initial energies

  1. 👍
  2. 👎
  3. 👁
  1. Q initial=10u*30=300u
    That charge then redistriubtes (equivalent capacitor=60uf
    C=Q/V
    V=Q/C-300u/60=5volts

    energy initial=1/2 CV^2=1/2 *10u*900=4500u Joules

    energy final=1/2 CV^2=1/2 60u*5^2
    30*25u=750u

    So where did the energy go? A paradox? http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capeng2.html#c4

    1. 👍
    2. 👎
  2. am not understanding the working well

    1. 👍
    2. 👎
  3. Good

    1. 👍
    2. 👎
  4. 👍🏻👍🏻👍🏻

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A 3.00 - µF and a 4.00 - µF capacitor are connected in series, and this combination is connected in parallel with a 2.00 - µF capacitor (see the figure ). What is the net capacitance? 3.00 - µF 4.00 - µF 2.00 - µF 26.0 V

  2. 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

  3. Physics

    Is this right? How much energy is stored in the 50mF capacitor when Va-Vb= 22V? d2vlcm61l7u1fs.cloudfront.net/media%2F124%2F124132e5-a337-4114-a87e-52ff10e2d432%2FphpiTZORo.png For the parrallel of top25uF and bottom25uF, I got

  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

  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

  2. 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?

  3. College Physics

    After 2.5 time constants, what percentage of the final voltage, emf, is on an initially uncharged capacitor C, charged through a resistance R?

  4. 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

  1. 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

  2. Physics

    (a) How much charge does a battery have to supply to a 5.0 uF capacitor to create a potential difference of 1.5 V across its plates? How much energy is stored in the capacitor in this case? (b) How much charge would the batter

  3. Physics

    Two capacitor of a capacitance 4uf and 6uf are connected in series to a 100volt DC A.draw the circuit diagram B.calculate the energy on either plates of each capacitor C.potential difference across eàch capacitor D.energy in the

  4. physics

    If three unequal capacitors, initially uncharged, are connected in series across a battery, which of the following statements is true? 1 The equivalent capacitance is greater than any of the individual capacitances. The capacitor

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