Question

14. (10 pts) Lightning (a flow of electrons between the ground and a thundercloud) lasts about 120us. The rate of charge flow in a typical lightning bolt is about 25,000 coulombs per second. A) How much total charge flows between the ground and the cloud during a typical lightning bolt? B) How many electrons flow during this time? 15. (10 pts) 4 charges are placed at the corners of a square of side 1 m. What is the electric field at the center P? Зрс Зрс -3uc -3uc

Answer 1

Lightning duration = 12ofes Rate of charge flow = 25000 colombs second Total charge flows = 25000x 120x106 - 3 condombs I electeos charge = 1.6x10lac electeons = 10 19 1.6x1019 ele I - = 1. 875X10 electrons = 1. 875xioe Total clecteons = 3x 1.6x1019 3fc im Buc VPRAVO C -3/4c Electric field due to a positive charge is away from the charge and towards the point Electric feeld due to a regature charge is towards the charge and away from the porst. Resolving the four vectors, it is found that the net field is is the downward derectron at P. E = 34 E, ? + E2² +2E, E₂ Cos 90 Eil=E2 ) = E3) = 1EA) = 3x10 ATTE. (2) = 3x10 4588.854 x 10 = 3x006 5392 6.45 E = 2X BX (53926.45) E = 152527.03 Nel