A capacitor with capacitance C is connected to a battery until ...

[Metfan725]

A capacitor with capacitance C is connected to a battery until charged, then disconnected from the battery. A dielectric having constant  is inserted in the capacitor. What changes occur in the charge, potential and stored energy of the capacitor after the dielectric is inserted?
 
  1.V stays same, Q increases, U increases
  2.V stays same, Q decreases, U stays same
  3.V increases, Q decreases, U increases
  4.V decreases, Q stays same, U decreases
  5.None of the above
  6.Cannot be determined

Question 2

Two parallel conducting plates form a capacitor. With a metal cylinder of length half the plate separation inserted between the plates, it is connected to a battery with potential V. The cylinder is now removed.
 
   
   
 
   HOW MANY of the quantities
   C, V, Q, E, and U change?

  1.0
  2.1
  3.2
  4.3
  5.4
  6.5
  7.Impossible to determine

[Swizqar]

Answer to Question 1

4

Answer to Question 2

6