alleryStart learning →An air-cored solenoid has 200 turns, length 20 cm and area 5 cm^2. Roughly what is its inductance?
A0.1257 mH
B1.257 mH
C12.57 mH
D0.01257 mH
Answer & Solution
Correct answer: A. 0.1257 mH
L = mu0 N^2 A / l = 4 pi x 10^-7 x 40000 x 5 x 10^-4 / 0.2, which is about 0.126 mH.
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