Consider a cloudless day when the sun shines down across the united states. if 2793 kj of energy reaches a square meter (m2) of the united states

magnityde and direction

v=ir = 3x15 =45 v

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it