Chapter 26. Capacitors and blelectries he Capacitor as an Energy-Storing Device

Question

Chapter 26. Capacitors and blelectries he Capacitor as an Energy-Storing Device 10 of 10 > Learning Goal: To understand that the charge stored by capacitors represents energy, to be able to calculate the stored energy and its changes under different circumstances An air-filled parallel-plate capacitor has plate area A and plate separation d. The capacitor is connected to a battery that creates a constant voltage V Part B The capacitor is now disconnected from the battery, and the plates of the capacitor are then slowly puled apart unsi the separation reaches 3d Find the new energy U1 of the capacitor after this process Express your answer in terms of A, d, V., and co. View Available Hints) Submit Incorrect: Try Again: 3 attempts remaining Part C is now reconnected to the battery, and the plate separation s lled Find the energy Uz of the die is restored to d A dieisctrc plate is soely moved into the capacior ant to d capacitor The capactor remains connected to the battary The capacitor the entire space between the plates i The delectrelconstant is 10 Type here to search

Explanation / Answer

C1 = e0  A / 3 d

U1 = 1/2 C1 V2

U1 = 1/2 * (e0  A / 3 d) * V2

new enegy = e0 A V2 / 6 d

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