Please answer the following question clearly. Exercise 21.2 Part A Lightning occ

Question

Please answer the following question clearly. Exercise 21.2 Part A Lightning occurs when there is a flow of electric charge (principally electrons) between the ground and a thundercloud. The maximum rate of charge flow in a lightning bolt is about 20,000 C/s; this lasts for 100 jus or less. How much charge flows between the ground and the cloud in this time? Express your answer using three significant figures. Submit My Answers Give Up Part B How many electrons flow during this time? Express your answer using three significant figures. Submit My Answers Give Up Provide

Explanation / Answer

21.2   given minimum rate of charge = 20,000 C/s
   time duration t = 100 micro s

   A. Charge = rate of charge * time = 20,000*100*10^-6 = 2 C
   B. number of electrons = charge/charge on electron = 2/1.6*10^-19 = 1.25*10^19 electrons

21.12 given charge q = -0.510 micro C
   force, F = 0.7 N ( upward )
   unknown charge = Q
   charge is located d = 0.3 m below q

   so, as Q is atraceted to q, Q should be +ve

   a. from coloumbs law
   kQq/d^2 = 0.7
   8.98*10^9*0.510*10^-6*Q/0.3^2 = 0.7
   Q = 1.375*10^-5 C

   b. from action reaction pair
       force exeerted on -0.510 micro C = 0.7 N
   c. direction of this force is downwards

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