A swimmer is distance D = 35 meter from a lightning strike in the water with I=78 kA. The water ρ=30 Ωm. The width of the swimmer along a radial line from the strike is .7 meter and his resistance across that width is 4 kΩ. Suppose that the current spreads through the water over a hemisphere centered on the strike point. Find what is the current through the swimmer?