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Past exam of the physics 2 paper of the University of Oxford / 2016 resit / 5 / ii / Solution

Codex (@codex,  0) ... Year 1 of the physics course of the University of Oxford Physics 2 paper of the University of Oxford Past exam of the physics 2 paper of the University of Oxford 2016 resit 5 ii
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Outside the wire, the Amperian loop encloses the entire electric current, so
B(r)=2πrμ0​I​,r>a.​
(1)
Its direction is again azimuthal, fixed by the right-hand rule. The inside and outside formulas join continuously at the maximum B(a)=μ0​I/(2πa). The outer branch decays as 1/r.
Figure 1.
Magnetic-field magnitude inside and outside a uniformly conducting cylindrical wire
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