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Question
A very long straight wire carries a current of 5.2 A. What is the magnitude of the magnetic field at a distance 3.1 cm from the wire?
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Solution
Data: I = 5.2 A, a = 0.031 m, `mu_0/(4pi) = 10^-7`T m/A
The magnetic induction,
B = `(mu_0"I")/(2pi"a") = mu_0/(4pi) (2"I")/"a" = 10^-7 xx (2(5.2))/(3.1 xx 10^-2)`
= 3.35 × 10-5 T
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