Physics
JAMB 1999
At what frequency would a 10H inductor have a reactance of 2000Ω?
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A.
π/200Hz
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B.
π/100Hz
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C.
100/πHz
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D.
100πHz
Correct Answer: Option C
Explanation
Inductive reactance XL = 2πfL
∴ 2πfL = 2000Ω
then f = 2000Ω/2 x π x 10
f = 100/πHz
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