AP Physics 2mediummcq1 pt
An initially uncharged capacitor in an RC circuit charges to about what fraction of full voltage after one time constant?
A.63%
B.37%
C.100%
D.50%
Explanation
Core Concept
V = V₀(1 − e⁻¹) ≈ 0.632V₀ after one τ.
Correct Answer
A63%
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