Task 00089.
The distance between the plates of a flat air capacitor with an area of 50 cm ^ 2 varies from 3 to 10 cm. The capacitor was charged to a voltage of 200 V and disconnected from the current source. Find the magnitude of the change in the field energy of the capacitor. What is the work of expanding the capacitor plates?
Detailed solution with a brief record of the conditions, formulas and laws used in the decision, the conclusion of the calculation formula and the answer.
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