**Current**5. To protect your new cabin in the woods, you have installed a 5.0-m-tall iron lightning rod next to the cabin. Lightning bolts can carry up to 50 kA of current and last up to 50 μs (5.0 × 10⁻⁵ s). a. How much **total charge** is delivered by a lightning bolt with these specifications? b. During this lightning strike, you need to keep the potential difference between the top and bottom of the iron rod to 100 V or less. To accomplish this, **what minimum radius should the iron rod have?**---**TABLE 27.2 Resistivity and conductivity of conducting materials**| Material | Resistivity (Ω m) | Conductivity (Ω⁻¹ m⁻¹) ||-------------|-------------------|------------------------|| Aluminum | 2.8 × 10⁻⁸ | 3.5 × 10⁷ || Copper | 1.7 × 10⁻⁸ | 6.0 × 10⁷ || Gold | 2.4 × 10⁻⁸ | 4.1 × 10⁷ || Iron | 9.7 × 10⁻⁸ | 1.0 × 10⁷ || Silver | 1.6 × 10⁻⁸ | 6.2 × 10⁷ || Tungsten | 5.6 × 10⁻⁸ | 1.8 × 10⁷ || Nichrome* | 1.5 × 10⁻⁶ | 6.7 × 10⁵ || Carbon | 3.5 × 10⁻⁵ | 2.9 × 10⁴ |*Nickel-chromium alloy used for heating wires.

Current is defined as the flow of charge through a conductor in a unit time. It is given by, I=qt…

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