Abstract

Using an example of Press and Bardeen, Newman-Penrose quantities of the electromagnetic field in a Schwarzschild background are related to a differential conservation law and hence changes result from a flux. There is no discontinuity in the quantities resulting from a sudden change in dipole moment; there is no singular surface which moves out at $\frac{1}{3}$ the speed of light. It is suggested that for Newman-Penrose quantities to exist, multipole moments must approach a limit as $\frac{1}{u}$, $u\ensuremath{\rightarrow}\ensuremath{-}\ensuremath{\infty}$.

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