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38. Choose the correct statement regarding the nature of electromotive force (emf): A. In batteries and accumulators emf is based on the energy of electromagnetic radiation. B. In batteries and accumulators emf is based on mechanical energy C. In solar cells emf is based on the energy released during exo-energetic chemical reactions D. In electric generators emf is based on the energy released during exo-energetic chemical reactions E. In solar cells em is based on the energy of electromagnetic radiation
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