Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 9 (Q.No. 45)
45.
VR at t < T, t = ∞


Answer: Option
Explanation:
At t = 0, C1, C2, C3 acts as short.
∴ entire voltage will appear cross R.
At t increases the voltage across the resistance decrease exponentially.
T = RCnet = 10 x 2.5 x 10-6 = 25 μ sec
Initial voltage
VR = V0e-t/RC at t = 0 = 100
= 100 e-t/25x10-6 V.
VR = 100 e-40x104t V.
At t = ∞, VR = 0
The charge C0 will be distributed in C1, C2, C3 and no current will flow.
Discussion:
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