The switch S shown in figure is kept closed for a long time and then opened at t = 0, then the current in the middle 20 Ω resistor at t = 0.25 ms is:
Text Solution
Verified by ExpertsThe correct answer is:
C
Switch is kept closed for a long time,
Current through 20 Ω resistor i = 
Charge on the capacitor at steady state,
q 0 = 25 × 
× 20 = 150 µC
at t = 0, switch is opened, i = i 0 e – t/ τ τ
= RC = 20 × 25 = 500 µS 
Current i = 
i = 
= 0.189 A
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