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Which pair of quantities is NOT related by a spatial derivative?

  • A.potential and field intensity
  • B.field intensity and charge density
  • C.vector potential and magnetic flux density
  • D.potential and energy density

Answer: D

Energy density is an algebraic function of the field, being half the permittivity times its square, with no differentiation involved. The other three pairs are connected by a gradient, a divergence and a curl respectively.

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