During lightning strikes from a cloud to the ground, a current of 20 kA occured and lasted for about 55-us. How much charge is transferred from the cloud to the earth during the strike?

(a) Copper Copper Nichrome In the circuit shown in the diagram, two thick wires connect a 1.6 volt battery to a Nichrome (NiCr) wire. Each thick connecting wire is 14 cm long, and has a radius of 9 mm. The thick wires are made of copper, which has 8.44 -1028 mobile electrons per cubic meter, and an electron mobility of 0.00424 (m/s)/(V/m). The Nichrome wire is 5 cm long, and has a radius of 4 mm. Nichrome has 9.1 -1028 mobile electrons per cubic meter, and an electron mobility of 7.1E-5 (m/s)/(V/m). What is the magnitude of the electric field in the thick copper wire? 13.571 (b) What is the magnitude of the electric field in the thin Nichrome wire? V/m V/m

) An electron beam consist of 1016 electrons passing through a given cross section n one minute. (a) Determine the current in amperes. (b) If the potential difference between the tip of the electron gun and the screen is 5000 V, determine the resistance of the path taken by the electron beam.