Abstract
The relations between the total evolution rate of mass and angular momentum and the ratio of the mass accretion rate to energy extraction rate concerning the central black hole of an accretion disk in the Blandford-Znejek process are investigated in detail in this paper.The effect of the Blandford-Znajek process on the evolution of the inner marginal radius of the black-hole accretion disk is discussed on the basis of the above relations. In addition, it is shown that the entropy of the central black hole always increases in this process.
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