Question Detail
Question
A 2μF capacitor charged to 50V is discharged through a 1MΩ resistor. Find time to drop to 25V.
Correct Answer
Option D is the correct answer.
Detailed Explanation
V(t) = V₀e^(-t/RC). 25 = 50e^(-t/2). t = -2ln(0.5) = 1.386s. RC = (1×10^6)(2×10^-6) = 2s.
Hint
Use the discharge equation V(t) = V₀e^(-t/RC).