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Conformal Killing forms are a natural generalization of conformal Killing vector fields. These forms have applications in physics related to hidden symmetries, conserved quantities, symmetry operators, or separation of variables. In this paper, we prove two vanishing theorems of conformal Killing forms on a space-like totally umbilical submanifold of a Lorentzian manifold. Finally, we show an application of these results to electrodynamics in the General Relativity Theory.