Problem: The switch in a circuit has been closed for a long time and is opened a

Question

Problem: The switch in a circuit has been closed for a long time and is opened at t=0.

This circuit has a voltage source, resistor, capacitor, and another resistor in that order.
Question: How do I go about calculating the initial value v(t) (across capacitor) and the initial energy stored in the capacitor?


This circuit has a voltage source, resistor, capacitor, and another resistor in that order.
Question: How do I go about calculating the initial value v(t) (across capacitor) and the initial energy stored in the capacitor?

Explanation / Answer

Note that the switch in a circuit has been closed for a long time and is opened at t=0, so the initial value v(t) (across capacitor) is emf V of the voltage source, and the initial energy stored in the capacitor is V^2/(2C)

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