RC Circuits - Problem 6 - Voltage across a Capacitor after a long time.

Problem 6: Physics Ninja shows how to calculate the voltage across a capacitor after a long time.

[@opufy]

hoooooweeeee god i love you ninja, this was the problem in my workbook can you believe that???

[@meryemk3531]

why is the last current -100 I please ??? how can we know that

[@silenttrickster9064]

I didn't get what you are asking but .. Bro, you don't need to apply KVL for this question,... Just remember, capacitor in steady state behaves as open circuit... Now, open all the wires which has capacitors in it at steady state (draw a new diagram for better understanding)... Find equivalent resistance, then, using ohms law find the current, then, as you see the potential difference across the 100 micro farad capacitor is same as that in 1500 ohm resistor.. (Parallel connection) using ohms, find the potential across the resistor by Multiplying the current to it.... As the current in 100 micro farad capacitor is 0, potential drop by resistance is 0, then the potential you acquired earlier is same as that across the capacitor... Thank me later.

[@meryemk3531]

@@silenttrickster9064thanks I get what youre saying and I am girl btw i am just struggling to understand all that 😭😭 do you have any videos suggestion to help me understand all that ? like how do you know that it behaves like an open circuit ... please suggest me 🙏🏼

[@silenttrickster9064]

@@meryemk3531 capacitor in a circuit, when the switch is just closed, then you just short circuit the capacitor as it is charging.... But if the switch is closed for long, it behaves as open circuit (charging of capacitor is complete at infinity)...finding charge at any other intermediate is different story, it has different formulas ....There are many explanation vids but if you want english only, then, I don't know much, but ig khan academy has it...