Discussion
The steps of deriving Poynting's theorem are listed below. Put them in order.
1. Substitute the two curl equations 2. Expand the divergence of the cross product by the vector identity 3. Integrate over a volume and apply the divergence theorem 4. Recognise the energy density and dissipation terms
Answer: C
The identity comes first because it is what introduces the curls, then the field equations are substituted, then the resulting terms are recognised as energy densities and dissipation, and the integration converts the whole into the familiar volume and surface statement.
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