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Past exam of the mathematics course of the University of Cambridge / 2008 / ib / Paper 3 / 17B / i / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2008 ib Paper 3 17B i
Created 2026-09-24 Updated 2026-10-14  0 By others on same topic  0 Discussions Create my own version
Take the curl of the vacuum Faraday law and use the vacuum Ampere-Maxwell law:
∇×(∇×E)=−∂t​(∇×B)=−μ0​ε0​∂t2​E.
(1)
Since the electric divergence vanishes, the double-curl identity makes the left side −ΔE. Therefore the electromagnetic wave equation is
ΔE−c21​∂t2​E=0,c=μ0​ε0​​1​.​
(2)
The same calculation interchanging the fields gives the wave equation for B.

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