Question:
A coil of inductance 300 mH and resistance 2Ω is connected to a source of voltage 2 V. The current reaches half of its steady state value in
A coil of inductance 300 mH and resistance 2Ω is connected to a source of voltage 2 V. The current reaches half of its steady state value in
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RL circuit current growth:
I = I₀(1-e⁻t/τ)
Updated On: Mar 20, 2026
- 0.1 s
- 0.05 s
- 0.3 s
- 0.15 s
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The Correct Option is B
Solution and Explanation
Step 1: Time constant τ = (L)/(R) = (0.3)/(2) = 0.15s
Step 2: (I)/(I₀) = 1 - e⁻t/τ
Step 3: For I = (I₀)/(2): t = τ ln 2 ≈ 0.05s
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