 Solution

ID: past-exam-of-the-physics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2022/section-b/10/a/solution

R

gives

B (2 π R) = μ_{0} I

. Therefore

B = \frac{μ _{0} I}{2 π R} ϕ .

Here

μ_{0}

is the vacuum permeability and the azimuthal direction follows the right-hand rule around the electric current. The magnetic field is measured in

T

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