Discussion
The steps of deriving the wave equation are listed below. Put them in order.
1. Take the curl of the Faraday equation 2. Substitute the Ampere equation for the curl of H 3. Expand the curl of the curl 4. Drop the divergence term in a source-free region
Answer: A
Taking the curl of the Faraday equation produces a curl of a curl on the left and a time derivative of the curl of B on the right; expanding the left and dropping the divergence term leaves a Laplacian, and only then is the Ampere equation substituted on the right.
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