physics

posted by .

A slab of copper of thickness b = 1.566 mm is thrust into a parallel-plate capacitor of C = 4.00×10-11 F of gap d = 10.0 mm, as shown in the figure; it is centered exactly halfway between the plates.

If a charge q = 3.00×10-6 C is maintained on the plates, what is the ratio of the stored energy before to that after the slab is inserted?

How much work is done on the slab as it is inserted?

Is the slab pulled in or must it be pushed in?

  • physics -

    when you put the slab of copper in, you are making two capacitors in series, reducing capacitance.

    Find the new capacitance. Then, knowing q is the same, find V across each capacitor.

    Knowing Q, V you can find energy stored. Then, compare it to the original. If energy is greater, then you had to push the plate in, if energy is less, the copper was pulled in.

  • physics -

    i think i know wat to do, but i'm having trouble finding the area.

  • physics -

    How do you find the area?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    Two charges are placed between the plates of a parallel plate capacitor. One charge is +q1 and the other is q2= +5.00x10^-6 C . The charge per unit area on each plate has a magnitude of sigma=1.30 x 10^-4 C/m^2. The force on q1 due …
  2. Physics

    Two charges are placed between the plates of a parallel plate capacitor. One charge is +q1 and the other is q2= +5.00x10^-6 C . The charge per unit area on each plate has a magnitude of sigma=1.30 x 10^-4 C/m^2. The force on q1 due …
  3. physics parallel plate

    A proton traveling at a speed 1.0*106 m/s of enters the gap between the plates of a 2.0-cm-wide parallel-plate capacitor. The surface charge densities on the plates are 1*10^-6 C/m2. How far has the proton been deflected when it reaches …
  4. College Physics

    A 12.0- A 12.0- A 12.0-V battery remains connected to a parallel plate capacitor with a plate area of 0.204m^2 and a plate separation of 3.14mm . What is the charge on the capacitor?
  5. Physics

    The potential difference between the plates of a parallel plate capacitor is 35 V and the electric field between the plates has strength of 750 V/m. If the plate area is 4.0 × 10-2 m2, what is the capacitance of this capacitor?
  6. Physics

    a parallel plate capacitor, 10µF with air between its plate is connected to a 50 volt source and then disconnected. a)What is the charge on the capacitor and the potential difference across it.
  7. Physics

    An air filled parallel plate capacitor initially has a capacitance of C = 4.57 nF. Then the air gap between the plates is filled with two different dielectric materials with equal volume but with relative permittivities of å1 = 3.68 …
  8. Physics

    A parallel plate capacitor has a rectangular plates with length 5cm and width 3cm. They are separated by a distance 12m and hooked up to a 20V battery A.) what is the area of each plate in m^2 B.) assuming nothing else is present on …
  9. Physics

    Two large parallel plates are separated by a small gap of distance 2 mm. See figure below. A fluid with dynamic viscosity µ = 10-3 Pa.s fills the gap between the plates. The surface area of each side of the plates is 2 m2. The top …
  10. Physics

    An electron traveling at 7.00 x 10^6 m/s enters and passes through a parallel plate capacitor. determine the electric field generated by the capacitor. note that the electron just clears the corner of the positive plate. The distance …

More Similar Questions