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A long straight wire carries 10 A. What is the field 5 cm from it?
A4 × 10^-5 T
B2 × 10^-5 T
C8 × 10^-5 T
D4 × 10^-6 T
Answer & Solution
Correct answer: A. 4 × 10^-5 T
B = μ0 I / 2πR = 2 × 10^-7 × 10 / 0.05 = 4 × 10^-5 T.
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