Задача 31097.

A flat air condenser with a plate area of 100 cm ^ 2 and a distance of 1 mm between them is charged up to 100 V. Then the plates are moved apart to a distance of 25 mm. Find the energy of the capacitor before and after the separation of the plates, if the voltage source before the extension is turned off.

A detailed solution with a brief record of the conditions, formulas and laws used in the solution, the derivation of the calculation formula and the answer.
If you have questions about the solution, write. I will try to help.