Home » Network Theory » Network Elements and the Concept of Circuit » Question

Network Elements and the Concept of Circuit

  1. S is in position (a) for a long time. S moved to position (b) at t = 0—, At t = 0+, the values of IC and VL are—


    1. – 5, 0
    2. 5, 0
    3. 0, 4
    4. – 2, 3
Correct Option: A

Where switch S is in position (a) for a long time in steady state in opened L is short. The circuit looks like

l L = 5 ×
4
= 4A
4 + 1

VC (0) =VC (0+) = 4 × 1 = 4 V
As the switch is moved to position (b) current through 4 Ω resistor
=4
4
= 1 A
4

∴ Current through capacitor = – (1 + 4) = – 5 A
VL = 4 × 1 = 4
∴ as the two voltage are in opposite sign
so VL = 0 V



Your comments will be displayed only after manual approval.