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Fig. 2. The experimental apparatus produced a resultant magnetic field due to the
combination of the geomagnetic field and the imposed magnetic field. The eel
and the solenoid are placed in a west-east direction. When the artificial
magnetic field is varied to 12 663 nT, the intensity of the resultant field
becomes 34 611 nT redirected 21° easterly. The 80° redirection is not
shown in this figure.