Calculating time constant in RC circuit

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The time constant in an RC circuit is calculated using the formula T = RC. Users are encouraged to determine the correct equivalent resistance (Req) for accurate calculations. The Thevenin equivalent method is suggested as a reliable approach to simplify the circuit analysis. One participant successfully applied this method after initial difficulties with different resistance combinations. Utilizing the Thevenin equivalent can enhance understanding and accuracy in calculating the time constant.
Hitman6267
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I know that T = RC

I've tried different combinations of R (not really sure what Req to take) but none of them worked. Any one can show me the right way ?
 
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Have you tried taking the Thevenin equivalent for point a to b?
 
No I haven't and it was suggested on another forum and it worked. Thank you :)
 
Thread 'Correct statement about size of wire to produce larger extension'
The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...

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