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An unneutral electron cloud of 3×1013 electrons with a number density of 1011 cm-3 was compressed and confined by a multiple‐mirrored toroidal magnetic field. The radial electric field associated with this electron cloud was about 105 V/cm. The electrons, having a large magnetic moment, were confined by the magnetic mirrors. An upper limit of 1 A was set on the induced current when a toroidal electric field of 10 V/cm was applied. This puts a limit n≪4×108 cm-1 on the line density of electrons with perpendicular energy lower than 300 eV.