alleryStart learning →A wire carries 20 A. At what distance is its field 4 x 10^-5 T?
A5 cm
B10 cm
C20 cm
D40 cm
Answer & Solution
Correct answer: B. 10 cm
r = mu0 I/(2 pi B) = 2 x 10^-7 x 20/(4 x 10^-5) = 0.1 m.
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