1)If 1.80x10^20 electrons move through a pocket calculator during a full day’s o
ID: 2000973 • Letter: 1
Question
1)If 1.80x10^20 electrons move through a pocket calculator during a full day’s operation, how many coulombs of charge moved through it? (answer in units of C, be careful of your signs)
2)Common static electricity involves charges ranging from nanocoulombs to microcoulombs. How many electrons are needed to form a charge of –2.00 nC? (answer in x101010 electrons, for the magnitude of the fundamental unit of charge, use 1.60x10^19 C for the remainder of the online homework for the course, be careful of your signs)
3)To start a car engine, the car battery moves 3.75x10^21 electrons through the starter motor. How many coulombs of charge were moved? (answer in C, be careful think about the sign of the charge moved)
4) A certain lightning bolt moves 40.0 C of charge. How many fundamental units of charge is this? (answer in x10^20 fundamental units, report only the magnitude, do not include the sign, the problem is just asking for a number)
5)How strong is the attractive force between a glass rod with a 0.700x10^6 C charge and a silk cloth with a - 0.600x10^6 C charge, which are 12.0 cm apart, using the approximation that they act like point charges? (answer in N, report only the magnitude. For the remainder of the course in online homework use k=9.00x10^9 Nm^2/C^2 with 3 sig figs in Coulomb's Law)
Explanation / Answer
1) Charge = charge_on_one_electron*no_of_electrons = -1.6*10^(-19)*1.80x10^20 = -28.8 C Answer
2) no_of_electron = charge/charge_on_one_electron = 2*10^(-9)/(1.6*10^(-19)) = 1.25*10^10 Answer
3) charge = charge_on_one_electron*no_of_electrons = -1.6*10^(-19)* 3.75x10^(21) = -600 C Answer
4) no_of_electron = charge/charge_on_one_electron = 40/(1.6*10^(-19)) = 2.5*10^20 Answer
5) Force = K*Q1*q2/R^2 = 9*10^(9)*0.7*10^(-6)*0.6*10^(-6)/(0.12*0.12) = 0.2625 N Answer
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