Question

The switch S is kept closed for a long time in Fig.. It is opened at t = 0. Find the current in R₁ at t = 1 ms –

• A. 11.2 mA
• B. 12.4 mA
• C. 13.4 mA
• D. 14.4 Ma

Answer 1

Answer: (C)

13.4 mA

Answer 2

Q = Q₀ e^–t/RC, $\frac{dQ}{dt}$ = i ∴ i = $\frac{Q_{0}}{RC}$ e^–t/RC