A coil has a resistance of 100 Ω. With a 1000 Hz AC supply, the applied voltage leads the current by 45°. What is the inductance of the coil?
Correct answer A. 16 mH
Explanation
A 45° phase angle means reactance equals resistance, so 2πfL = 100 Ω and L = 100 ÷ (2π × 1000) ≈ 0.016 H, or 16 mH.
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