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A voltage having the laplace transform is applied across a 2H inductor having zero initial current What is the current in the inductor at t = ∞?
  • a)
    zero    
  • b)
    (1/5) A
  • c)
    (2/7) A    
  • d)
    (2/5) A
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A voltage having the laplace transformis applied across a 2H inductorh...
Step-by-step solution
  1. Write the Laplace-domain relation for an inductor
    For an inductor of inductance L with zero initial current:
    V(s) = L s I(s)
  2. Express I(s) in terms of the given voltage transform
    Given V(s) = (4 s² + 3 s + 2) / (7 s² + 6 s + 5) and L = 2 H,
    I(s) = V(s) / (L s)
    = (4 s² + 3 s + 2) / [2 s (7 s² + 6 s + 5)]
  3. Apply the Final-Value Theorem to find the steady current
    The final-value theorem states that i(∞) = limₜ→∞ i(t) = limₛ→0 [s I(s)], provided all poles of s I(s) lie in the left half-plane.
    So
    i(∞) = limₛ→0 [s · (4 s² + 3 s + 2) / (2 s (7 s² + 6 s + 5))]
    = limₛ→0 [(4 s² + 3 s + 2) / (2 (7 s² + 6 s + 5))]
    = 2 / 10
    = 0.2 A
  4. Choose the correct option
    The steady-state current is 0.2 A (Option B).
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Community Answer
A voltage having the laplace transformis applied across a 2H inductorh...
Answer is 0.5A
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