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Derivation for curl of a vector

  1. Jan 31, 2016 #1
    I have attached the equation that I do not quite understand how is true. This is the current density and was simply used as a part of a proof. But how is this equation true? How does taking the curl of J give you this expression?

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  2. jcsd
  3. Jan 31, 2016 #2


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