Network Analysis and Synthesis - ECE Questions and Answers

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In given figure the switch was closed for a long time before opening at t = 0. The voltage V_x at t = 0⁺ is

25 V

50 V

-50 V

0 V

Answer : Option C

Explanation :

at t = 0, L will act as short circuit hence I = 2.5 A. V_x = 2.5 x 20 50v, but in opposite to current source. Hence V_x = - 50v.

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