Need Help with Homework Problem: Formula Needed

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The discussion revolves around a homework problem requiring a specific formula, which the poster struggles to identify. They suggest starting with T = RC, leading to a time of 1 second, but are unsure how to proceed. The poster seeks clarification on the correct formula to use or hints to solve the problem. A link to a resource on capacitor charging is provided for additional context. The overall focus is on finding the appropriate formula for the homework question.
Nymn
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I'm trying to figure out the answer to a homework problem, but I just don't know the formula. :|
I was going to explain it, but I figure a pic is easier.

http://img230.imageshack.us/img230/15/el1ko7.th.jpg


Now, I think you start with T = RC? With that, I get 1 sec. Then I divide each of the times by that? Rrrrrr! Can someone tell me what formula to use or give me a clue, at least? :(
 
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