03.44: A circular parallel-plate capacitor is connected to a battery in a circkv.ngt w sn, w,f48w8xuit. The capacitor is fully charged before the battery is disconne,wfs8w .g,tw vk4 xn8ncted from the circuit. A uniform material of dielectric constant $κ$ is inserted between the plates of the capacitor, effectively filling the space between the plates. Let $U_old$ be the energy stored by the capacitor before the dielectric was inserted, while $U_new$ is the energy stored after the dielectric was inserted. The ratio of $U_new/U_old$ is

  11.42: A parallel-plate capacitor olcxfucm 9+4oa1,9lerf capacitance C has an insulating dielectric material of constant4e9ou9lc f, +1l cxmar K filling the entire region between its plates. This capacitor now is connected to a battery of voltage V and is fully charged before the battery is disconnected. The capacitor stores energy U. Using insulating gloves, a person now removes the dielectric from the capacitor. After equilibrium is established following the removal of the dielectric, which one of the following choices best represents the energy stored by the capacitor in terms of U?

  14.47: An air-filled parallel-plate capacitor of capacitance C is fullqd8pbz9d mu; /xa eu8,y charged after being connected to a battery of voltage V. The battery then is disconnected and an insulating dielectr9 ;uz8bex,dp8 mdua/q ic slab of constant K is inserted between the capacitor’s plates, fully filling the region. What is the voltage between the plates once equilibrium is established with the dielectric in place?

  15.45: A 6.00 μF parallel-plate capacitor is dis/ borb sc 5,dupt*q/cg8i,b0sconnected from a 12 volt battery after being fully charged. A person now carefully inserts a dielectric material of constant K= 2 so that it fills one-half of the space between the plates as shown. How much work was done by the , 5obgstbub80 ,/dccp*/qs irperson while inserting the dielectric?