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(Abridged) The motion of a Schwarzschild black hole with velocity $v_0 =\beta_0 c$ through a constant magnetic field $B_0$ in vacuum induces acomponent of the electric field along the magnetic field, generating a non-zerosecond Poincare electromagnetic invariant $ ^* F \cdot F \neq 0$. This willproduce (e.g., via radiative effects and vacuum breakdown) an electric chargedensity of the order of $\rho_{\rm ind}= B_0 \beta_0 /(2 \pi e R_G)$, where$R_G = 2 G M/c^2$ is the Schwarzschild radius and $M$ is the mass of the blackhole; the charge density $\rho_{\rm ind}$ is similar to the Goldreich-Juliandensity. The magnetospheres of moving black holes resemble in many respects themagnetospheres of rotationally-powered pulsars, with pair formation fronts andouter gaps, where the sign of the induced charge changes. As a result, theblack hole will generate bipolar electromagnetic jets each consisting of twocounter-aligned current flows (four current flows total), each carrying anelectric current of the order $I \approx e B_0 R_G \beta_0$. Theelectromagnetic power of the jets is $L \approx (G M)^2 B_0^2 \beta_0^2/c^3$;for a particular case of merging black holes the resulting Poynting power is $L \approx {(G M)^3 B_0^2 /(c^5 R)}$, where $R$ is the radius of the orbit. Inaddition, in limited regions near the horizon the first electromagneticinvariant changes sign, so that the induced electric field becomes larger thanthe magnetic field, $E>B$. The total energy loss from a system of merging BHsis a sum of two components with similar powers, one due to the rotation ofspace-time within the orbit, driven by the non-zero angular momentum in thesystem, and the other due to the linear motion of the BHs through the magneticfield.

Schwarzschild black holes as unipolar inductors: expected electromagnetic power of a merger