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What happens to the energy stored in a capacitor connected to a battery when a dielectric is inserted? Was work done in the process?

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(3) Would a metal ball with only one sign of charge (unlike a capacitor) store any energy? Explain.
A simple adjustable parallel-plates capacitor is shown below. The plates have a radius of 8.0 cm and they are separated by a gap of 0.50 cm with nothing in between them. (a) Calculate the capacitance of this capacitor. (b) Calculate the charge stored when a battery of 9 V is connected to the capacitor. (c) Calculate the energy stored in the capacitor. (d) While the battery is still connected to the capacitor, a 0.50 cm-thick piece of wood (dielectric constant ? = 4.0) is inserted into the gap between the plates. Describe and explain what would happen to the capacitor’s voltage, to the capacitance, and to the stored charge.
the electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference between the plates of an 730-uF capacitor is 330V. (a) determine the energy that is used to produce the flash in this unit. (b) assuming the flash lasts for 6.6 ms, find the effective power or wattage of the flash