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The Blandford-Znajek process, the steady electromagnetic energy extractionfrom a rotating black hole, is widely believed to work for driving relativisticjets, although it is still under debate where the electric current is driven.We address this issue analytically by investigating the time-dependent state inthe Boyer-Lindquist and Kerr-Schild coordinate systems. This analysis suggeststhat a non-ideal magnetohydrodynamic region is required in the time-dependentstate, while not in the steady state.

Where is the electric current driven in the Blandford-Znajek process?