1a. Whenever lightning strikes the ground during a thunderstorm, currents as high as 20,000 A can occur. Lightning strikes last for a duration of roughly 50 us. What is the transfer of charge to the ground due to one single lightning strike? 1b. An unknown material in the shape of a cylinder with a length of 3.0 m and a diameter of 0.02 m is connected to a constant supply of potential difference equal to 20.0 V. An ammeter measures current through the material and reads a value of 23.0 A at 30 "C and 19.6 A at 100 C. Ignore any changes in volume of the material as a function of increased temperature. What is the resistivity (p) of the material at the reference temperature of 30'C? What is the temperature coefficient of resistivity (a) at that temperature?Incorrect Question 1 0 / 8 pts From Problem 1 Whenever lightning strikes the ground .. What is the transfer of charge to the ground due to one single lightning strike? Give the answer in units of C. 0.001 Incorrect Question 2 0 / 6 pts From Problem 2 An unknown material in the shape of a cylinder with a length . What is the resistivity (p) of the material at the reference temperature of 30 * C'? Give the answer as 10 0 . m (i.e. if p is 6.2 . 10 0 . m, then enter 6.2 as the answer). 1.43 Incorrect Question 3 0 / 6 pts From Problem 2 An unknown material in the shape of a cylinder with a length .. What is the temperature coefficient of resistivity (o) at that temperature? Give the answer in units of " C'-1 3.11Question 1 8 / 8 pts From Problem 1 Whenever lightning strikes the ground .. What is the transfer of charge to the ground due to one single lightning strike? Give the answer in units of C. Question 2 6 / 6 pts From Problem 2 An unknown material in the shape of a cylinder with a length . What is the resistivity (p) of the material at the reference temperature of 30 " C'? Give the answer as 10 0 . m (i.e. if p is 6.2 . 10 0 . m, then enter 6.2 as the answer). 9.1 Incorrect Question 3 0 / 6 pts From Problem 2 An unknown material in the shape of a cylinder with a length .. What is the temperature coefficient of resistivity (o) at that temperature? Give the answer in units of * C-1 0.00223 ) 2 = RX - Ro RX = 20 = 1. 0204 Ro AT 19. 6 Ro = 0.8698 DT = 100-30 - 70 Q = 1. 0204 - 0. 8696 - 2.430% X 10 - 3 70 X0 8696 0. 00249