03.44: A circular parallel-plate capacitor is connected to a battery in a coy70j8it(d t kircuit. The capacitor is fully charg 7 (t8dyki0jtoed before the battery is disconnected 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 of capacitance C has an insulating5o ,qfgkl67ey 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 thf7geql,6 k oy5e energy stored by the capacitor in terms of U?

  14.47: An air-filled p /t.y.min9ne zarallel-plate capacitor of capacitance C is fully charged after being connected to a battery of voltage V. The battery then is d.neym/tni z.9 isconnected and 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 disconnected froa9z4uv x)*r:. s8ywefs(k of om 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 person while inserf4:xe f( uz.)*o 98ysorskavw ting the dielectric?