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Bekenstein bounds for the entropy of a body imply an universal inequalitybetween size, energy, angular momentum and charge. We prove this inequality inElectromagnetism. We also prove it, for the particular case of zero angularmomentum, in General Relativity. We further discuss the relation of theseinequalities with inequalities between size, angular momentum and chargerecently studied in the literature.

Bekenstein bounds and inequalities between size, charge, angular momentum and energy for bodies