In a circuit where a capacitor charges through a resistor, the time constant RC is the time taken for the capacitor to reach about ____ of its final charge.
Correct answer C. 63%
Explanation
During charging q = q₀(1 − e^(−t/RC)). At t = RC, q = q₀(1 − 1/e) ≈ 0.63q₀. The figure 37% is the fraction remaining after one time constant of discharge.
Answer checked How we write and check questions
Discussion