Let V = 66 V, R = 150 Ω, and L/R = 1 s in the circuit. At the first stage, switches S₁ and S₂ are closed and open respectively, until the current (let's call it i₁) through the resistor reaches 80% of the current's value for i(t → ∞). At the second stage, S₁ is opened and S₂ is closed until the current through the resistor reaches 20% of the current i₁. Find the total time passed along the two stages in the unit of second(s).
- O2 ln(2.0)
- O2 ln(5.0)
- 2 ln(2.5)
- 2 ln(10.0)
- 2 ln(4.0)
R S₁ S₂