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 = ∞
500e-40x104t, 0
100e-40x103t, 0
100e-40x106t, 0
100e-40x104t, 0
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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