Professor M tries to fix his financial predicament by catching unicorns in the Wizard valley. He conducts a current of 50 kiloamperes to a point on the ground, which spreads spherically symmetrically to the ground. A unicorn will lose consciousness if there is a potential difference of 150 volts between its legs, and the distance between the legs of a normal full-grown unicorn is 1.7 meters. The resistivity of the Wizard valley soil is 103 Ωm. From how large an area does professor M have to collect unicorns to take to the zoo?

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