03.44: A circular parallel-plate capacitor is qf. r*ja c*kk5;b ml-nconnected to a battery in a circuit. The capacitor is fully charged before the battery is disconnected from the circuit. A uniform material of dielectric 5c.-njk* arlqb*k;mf 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 havco+8cw 0u ia*dgqg 00s an insulating dielectric material of congd0i+cq0v o cu0w*g 8astant 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-plaia.*/q/0 nnl .yvlm swwh8hg8te capacitor of capacitance C is fully charged after being connected to a battery of voltage V. The battery then is disconnected and an insulating dielectric slab of const.l/nm0agn iw/sq.y8 hvl *h8 want 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 p9 8,g(ypp.jxsoh/ka oarallel-plate capacitor is disconnected from a 12 volt battery after being fully charged. A person now carefully inserts a dielectric materi /xps9(j8yhkp oo,a g.al 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?