Along straight wire carries a current I. The magnetic field Bat a distance r from the wire is proportional to which of the following?

C. 1/r — According to the Biot-Savart law applied to an infinite straight wire, the magnetic field is given by B = (mu0 * I) / (2 * pi * r). Thus, the field is inversely proportional to the distance r.

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$Along straight wire carries a current I . The magnetic field B at a perpendicular distance r from the wire is proportional to which of the following?$

A. $r$
B. $r^{2}$
C. $1/ r$
D. $1/ r^{2}$

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Correct answer: C — $1/ r$

Solution

According to the Biot-Savart law applied to an infinite straight wire, the magnetic field is given by B = \frac{μ _{0} I}{2 π r} . Thus, the field is inversely proportional to the distance r .

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Along straight wire carries a current I. The magnetic field B at a perpendicular distance r from the wire is proportional to which of the following?

Solution

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