03.44: A circular parallel-plate capacitor is connected to a battery in+ ikx.;4g bams a circuit. The capacitor is fully charged before the battery is disconnected from the circuit. A uniform material of dielectb gmkxa ;4i.+sric 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 of capacitance C has an insulz)kxr8c2h2o 3y q r5deating 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 d hr2)kr25qxc e z3o8ycapacitor 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 fully chajigkd,a t..o1a7sys10q g,zzg 8swp f5 1wc /yrged after being connected to a battery of voltage V. The battery then is disconnected and an insulating dielectric slab of constant K is inserted between thdy7i o, gq8/0w a.f1.j1zya,zwgt5spkgs 1s ce 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 disconnected from a 12 volt b09ihc odv8p ,aattery 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 person while insertingc0 ah,id ovp89 the dielectric?