IB Physics Capacitors

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A tutorial sheet of capacitor questions starts below

  1. The distance between the parallel plates of a capacitor with an air gap is doubled, the potential difference between the plates remaining constant. Does the electric field strength between the plates change?
  2. The distance between the parallel plates of a capacitor with an air gap is doubled, the charge on each plate remaining constant. Does the electric field strength between the plates change?
  3. Does the capacitance increase, decrease or stay the same when a slab of dielectric material is placed between the plates which are connected to a battery of constant voltage?
  4. Does the capacitance increase, decrease or stay the same when a slab of dielectric material is placed between the plates on which the charge is kept constant?
  5. Why does the presence of a dielectric material between the plates change the capacitance?
  6. Does the force between the plates of a parallel plate capacitor increse, decrease or stay the same when a parallel sided dielectric slab half fills the distance between the plates, the plates being connected to a battery of constant voltage? When is the total energy of the capacitor greatest, before or after the slab is inserted? Explain the difference.
  7. A parallel plate capacitor is charged and then isolated from the supply. The plates are then moved further apart. State the changes that occur in the potential difference between the plates, the energy stored in the capacitor, the electric field strength between the plates and the capacitance.[increases,increases,constant,decreases]
  8. A parallel plate capacitor is maintained at a constant voltage. The plates are then moved further apart. State the changes that occur in the charge stored on the plates, the energy stored by the capacitor, the electric field strength between the plates and the capacitance.[decreases, decreases, decreases, decreases]