Flying Circus ofPhysics Kiting during a storm . The legend that BenjaminFranklin

Question

Flying Circus ofPhysics

Kiting during a storm. The legend that BenjaminFranklin flew a kite as a storm approached is only a legend —he was neither stupid nor suicidal. Suppose a kite string of radius2.08 mm extends directly upward by 0.820 km and is coated with a0.533 mm layer of water having resistivity 157 ·m. Ifthe potential difference between the two ends of the string is 165MV, what is the current through the water layer? The danger is notthis current but the chance that the string draws a lightningstrike, which can have a current as large as 500 000 A (way beyondjust being lethal).

Number

Units

the tolerance is +/-2%

Chapter 26, Problem 26

Explanation / Answer

         = 1.64 *1010
Then the Current through the layer will be I =(165*106V)/(1.64 * 1010)
            =1.006*10-2A             = 10.06 mA

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