03.44: A circular parallel-plate capacitor is connected to ad( /vghh+ pmj s5b,ytg 92m-dg battery in a circuit. The capacitor is fully charged before the battery is disconnected from the circuit. A uniform material of dielectri -tdjm 59+m ghyb,hs(d/g vpg2c 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 capd.s-2zvay0y , js md+facitor of capacitance C has an insulating dielectric material of constant 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+ ddj02svyfm-,y sza. of U?

  14.47: An air-filled parallel-plate capacitor of capacitance C is fully charge )jaa id;re(g av7t0k5d after being connected to a battery of voltage V. The battery then is disconnected aikd )t57ae;r(0a vjgand an insulating dielectric 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 disconntka,jbc66 2b,w hzl8b s (bo6bected from a 12 volt battery after being fully charged. A person now careful6bosc a,6(bbz8bhw2 6bj,ktl ly 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 person while inserting the dielectric?