The graph shows voltage during capacitor discharge. The time constant τ lies between:
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Question

The graph shows voltage during capacitor discharge. The time constant τ lies between:

G1 Physics · Accepted Answer

For exponential decay V=V₀e⁻ᵗ/τ, τ is the time at which V falls to V₀/e≈0.368V₀. From the graph this level is crossed between 100 s and 150 s. Correct answer: D.