alleryStart learning →A long straight wire carries 5 A. What is the magnetic field at 10 cm from it?
A1 x 10^-6 T
B5 x 10^-6 T
C1 x 10^-5 T
D2 x 10^-5 T
Answer & Solution
Correct answer: C. 1 x 10^-5 T
B = mu0 I/(2 pi r) = 2 x 10^-7 x 5/0.1 = 1 x 10^-5 T.
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