Energy stored before and after in the capacitor

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A 1 microfarad capacitor charged to 20V is connected in parallel with a 2 microfarad capacitor charged to 16V, prompting a discussion on calculating the energy stored before and after the connection. Participants emphasize the formula for energy stored in a capacitor, W = 1/2 C V, as a crucial starting point for solving the problem. There is a request for clarification on the correct application of formulas related to capacitors. The conversation highlights the importance of understanding both energy and charge in capacitor calculations. Accurate calculations will determine the energy changes resulting from the connection of the two capacitors.
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Homework Statement



A 1microf capacitor is charged to 20V and is connected in parallel to a 2microf capacitor charged to 16V. how much energy is stored before and after connection?

please anyone can help me with this problem
Thanks in advance

Homework Equations





The Attempt at a Solution

 
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Welcome to PF!

Hi Ankitshyani! Welcome to PF! :wink:

(have a mu: µ :wink:)

What is the usual formula for energy of a capacitor?

Show us how far you get, and where you're stuck, and then we'll know how to help! :smile:
 
hi there,

how are you...the formula for energy stored in the capacitor is: W = 1/2 C V ...

thanksss
 
Ankitshyani said:
hi there,

how are you...the formula for energy stored in the capacitor is: W = 1/2 C V ...

thanksss

No, CV is the charge of a capacitor …

go back to your book and study it again. :wink:
 
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Hi all, I have a structural engineering book from 1979. I am trying to follow it as best as I can. I have come to a formula that calculates the rotations in radians at the rigid joint that requires an iterative procedure. This equation comes in the form of: $$ x_i = \frac {Q_ih_i + Q_{i+1}h_{i+1}}{4K} + \frac {C}{K}x_{i-1} + \frac {C}{K}x_{i+1} $$ Where: ## Q ## is the horizontal storey shear ## h ## is the storey height ## K = (6G_i + C_i + C_{i+1}) ## ## G = \frac {I_g}{h} ## ## C...
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