alleryStart learning →A long straight wire carries 10 A. The field 5 cm away is
A2 x 10^-5 T
B4 x 10^-5 T
C4 x 10^-4 T
D8 x 10^-5 T
Answer & Solution
Correct answer: B. 4 x 10^-5 T
B = mu0 I/(2 pi R) = 2e-7 x 10/0.05 = 4e-5 T.
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