What is the reactance of a 0.20 H inductor on a 50 Hz supply?
Correct answer C. 62.8 Ω
Explanation
X_L = 2πfL = 2π × 50 × 0.20 = 62.8 Ω. Forgetting the 2π factor gives 10.0 Ω, and using π instead gives 31.4 Ω.
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