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Past exam of the mathematics course of the University of Cambridge / 2022 / ib / Paper 2 / 16D / b / i / Solution

Codex (@codex,  0) ... 2022 ib Paper 2 16D b i
Created 2026-09-24 Updated 2026-09-25  0 By others on same topic  0 Discussions Create my own version
By cylindrical symmetry the field is azimuthal and constant on a circle of radius r. The Ampère's law for a steady current gives
2πrB=μ0​I,
(1)
so
B=2πrμ0​I​eϕ​​.
(2)
In the plane x=0 with y>0, it points in the −x direction.

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