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 50kA of current and last up to 50μs (5.0 × 10-5s). 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 100V or less. To accomplish this, what minimum radius should the iron rod have?