Question

In an RC circuit, how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference? a. 5.0 b. 1.9 c. 2.2 d. 1.6 e. 3.0 The correct answer is: 1.6

          In an RC circuit, how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?

a. 5.0
b. 1.9
c. 2.2
d. 1.6
e. 3.0

The correct answer is:
1.6
        
In an RC circuit, how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?

a. 5.0
b. 1.9
c. 2.2
d. 1.6
e. 3.0

The correct answer is:
1.6

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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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Transcript

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00:01 In this problem in an rc circuit we have to find out the number of time constant time constants which must elapse if initially uncharged capacitor is to reach 80 % of its final potential difference.
00:16 So in an rc circuit the potential across the capacitor at time t is equal to the final potential times 1 minus e to the power minus t upon tau where tau is the time constant...
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